Questõesde UECE 2014
A energia elétrica é disponibilizada em nossas
residências na forma de tensão alternada. Isso
significa que entre os dois conectores de uma
tomada há uma diferença de potencial elétrico que
varia com o tempo conforme uma função do tipo U = (220√2) ∙ sen(2π ∙ 60 ∙ t), onde U é a diferença de
potencial e t é o tempo. A constante (220√2) é válida
para Estados em que o fornecimento de energia
elétrica monofásica é de 220 V nominal, como na
maioria das residências do Ceará. É correto afirmar
que essa diferença de potencial tem um valor
máximo e uma frequência, respectivamente, de
Um raio de luz se propaga pelo ar e incide em
uma lente convergente, paralelamente ao eixo
principal, saindo pela face oposta da lente. Sobre o
raio de luz após sair da lente, cuja espessura não é
desprezível, é correto afirmar que
Em um motor de carro o processo de
combustão gera 300 J de energia térmica. Deste
valor, 200 J são perdidos sob a forma de calor. Qual
a eficiência desse motor?
O biodiesel é um combustível biodegradável
que pode ser produzido a partir de gorduras animais
ou óleos vegetais. Esse combustível substitui total
ou parcialmente o óleo diesel de petróleo em
motores ciclo diesel automotivos. Considere que a
queima de 1,0 g de biodiesel libera x Joules de
energia e o rendimento do motor é de 15%. Qual o
trabalho mecânico realizado pelo motor, em Joules,
resultante da queima de 10 g desse combustível?
A aceleração da gravidade próximo à
superfície da Terra é, no Sistema Internacional de
Unidades, aproximadamente 10 m/s²
. Caso esse
sistema passasse a usar como padrão de
comprimento um valor dez vezes menor que o atual,
esse valor da aceleração da gravidade seria
numericamente igual a
Considere um tanque cilíndrico vertical. A
tampa plana inferior desse recipiente é substituída
por uma calota esférica de mesmo raio interno que o
cilindro. Suponha que o tanque esteja
completamente cheio de água. Nessas
circunstâncias, é correto afirmar que a pressão
hidrostática produz forças na superfície interna da
calota sempre
O poder calorífico da gasolina é 34,86 kJ/L.
Isso equivale a dizer que 1 L desse combustível tem
armazenados 34,86 kJ de energia no caso de sua
utilização em uma combustão perfeita. Suponha que
1 L de gasolina pudesse ser utilizado com 100% de
eficiência para produção de calor. Isso seria
suficiente para manter por 3486 s um aquecedor de
que potência, em W?
Duas massas iguais são presas entre si por
uma mola ideal que obedece à lei de Hooke.
Considere duas situações: (i) a mola é comprimida a
50% de seu tamanho original; e (ii) a mola é
distendida de 50% de seu comprimento original. O
termo tamanho original se refere à mola sem
compressão nem distensão. Sobre a energia elástica
armazenada na mola nas situações (i) e (ii), é
correto afirmar que
Um resistor ôhmico de 10 Ω é ligado a uma
bateria de 10 V durante 10 s. Caso 100% da energia
dissipada pelo resistor pudesse ser convertida em
trabalho para o deslocamento de uma massa, esse
valor seria, em Joules,
Dois raios de luz coplanares incidem sobre um
espelho plano. O primeiro raio incide normalmente
no espelho e o segundo, tem um ângulo de
incidência 30°. Considere que o espelho é girado de
modo que o segundo raio passe a ter incidência
normal. Nessa nova configuração o primeiro raio
passa a ter ângulo de incidência igual a
Uma gangorra em um parquinho infantil é
ocupada por dois gêmeos idênticos e de mesma
massa, Cosmo e Damião. Na brincadeira, enquanto
um dos irmãos sobe num dos acentos do brinquedo,
o outro desce no outro acento. O brinquedo pode ser
descrito como uma haste rígida, com um acento em
cada extremidade, e livre para girar em um plano
vertical em torno do ponto central. Considere os
torques na haste da gangorra exercidos pelas forças
peso de Cosmo (tc) e de Damião (td), em relação ao
ponto central. Na configuração em que Cosmo está
na posição mais alta, é correto afirmar que
Os planetas orbitam em torno do Sol pela
ação de forças. Sobre a força gravitacional que
determina a órbita da Terra, é correto afirmar que
depende
Duas forças atuam sobre um disco de massa
m, que inicialmente repousa com uma face sobre
uma mesa horizontal e pode deslizar sem atrito.
Considere que as forças sejam paralelas ao plano da
mesa, tenham módulos iguais e direções diferentes,
e que sejam aplicadas no centro do disco. Nessas
circunstâncias, é correto afirmar que o vetor
aceleração do disco
O uso de fontes alternativas de energia tem
sido bastante difundido. Em 2012, o Brasil deu um
importante passo ao aprovar legislação específica
para micro e mini geração de energia elétrica a
partir da energia solar. Nessa modalidade de
geração, a energia obtida a partir de painéis solares
fotovoltaicos vem da conversão da energia de fótons
em energia elétrica, sendo esses fótons
primariamente oriundos da luz solar. Assim, é
correto afirmar que essa energia é transportada do
Sol à Terra por
Considere uma garrafa de refrigerante posta
verticalmente sobre uma mesa horizontal. Com a
garrafa ainda fechada, sua parte superior, entre a
superfície do líquido e a tampa, é preenchida por um
gás pressurizado. Considere que o refrigerante está
inicialmente a 10 °C, e passados 10 minutos esteja
a 21 °C. Sobre o gás entre a superfície do líquido e
a tampa, é correto afirmar que, ao final dos 10
minutos,
“As technology evolves, publishers are adding
bells and whistles that encourage detours” is an
example of
TEXT
Clifford the Big Red Dog looks fabulous on an iPad. He sounds good, too — tap the screen and hear him pant as a blue truck roars into the frame. “Go, truck, go!” cheers the narrator. But does this count as story time? Or is it just screen time for babies? It is a question that parents, pediatricians and researchers are struggling to answer as children’s books, just like all the other ones, migrate to digital media.
For years, child development experts have advised parents to read to their children early and often, citing studies showing its linguistic, verbal and social benefits. In June, the American Academy of Pediatrics advised doctors to remind parents at every visit that they should read to their children from birth, prescribing books as enthusiastically as vaccines and vegetables.
On the other hand, the academy strongly recommends no screen time for children under 2, and less than two hours a day for older children.
At a time when reading increasingly means swiping pages on a device, and app stores are bursting with reading programs and learning games aimed at infants and preschoolers, which bit of guidance should parents heed?
The answer, researchers say, is not yet entirely clear. “We know how children learn to read,” said Kyle Snow, the applied research director at the National Association for the Education of Young Children. “But we don’t know how that process will be affected by digital technology.”
Part of the problem is the newness of the devices. Tablets and e-readers have not been in widespread use long enough for the sorts of extended studies that will reveal their effects on learning.
Dr. Pamela High, the pediatrician who wrote
the June policy for the pediatrics group, said
electronic books were intentionally not addressed.
“We tried to do a strongly evidence-based policy
statement on the issue of reading starting at a very
young age,” she said. “And there isn’t any data,
really, on e-books.”
But a handful of new studies suggest that reading to a child from an electronic device undercuts the dynamic that drives language development. “There’s a lot of interaction when you’re reading a book with your child,” Dr. High said. “You’re turning pages, pointing at pictures, talking about the story. Those things are lost somewhat when you’re using an e-book.”
In a 2013 study, researchers found that children ages 3 to 5 whose parents read to them from an electronic book had lower reading comprehension than children whose parents used traditional books. Part of the reason, they said, was that parents and children using an electronic device spent more time focusing on the device itself than on the story (a conclusion shared by at least two other studies).
“Parents were literally putting their hands over the kids’ hands and saying, ‘Wait, don’t press the button yet. Finish this up first,’ ” said Dr. Julia Parish-Morris, a developmental psychologist at Children’s Hospital of Philadelphia and the lead author of the 2013 study that was conducted at Temple University. Parents who used conventional books were more likely to engage in what education researchers call “dialogic reading,” the sort of back-and-forth discussion of the story and its relation to the child’s life that research has shown are key to a child’s linguistic development.
Complicating matters is that fewer and fewer children’s e-books can strictly be described as books, say researchers. As technology evolves, publishers are adding bells and whistles that encourage detours. “What we’re really after in reading to our children is behavior that sparks a conversation,” said Kathy Hirsh-Pasek, a professor of psychology at Temple and co-author of the 2013 study. “But if that book has things that disrupt the conversation, like a game plopped right in the middle of the story, then it’s not offering you the same advantages as an old-fashioned book.”
Of course, e-book publishers and app developers point to interactivity as an educational advantage, not a distraction. Many of those bells and whistles — Clifford’s bark, the sleepy narration of “Goodnight Moon,” the appearance of the word “ham” when a child taps the ham in the Green Eggs and Ham app — help the child pick up language, they say.
There is some evidence to bear out those claims, at least in relation to other technologies. A study by the University of Wisconsin in 2013 found that 2-year-olds learned words faster with an interactive app as opposed to one that required no action.
But when it comes to learning language, researchers say, no piece of technology can substitute for a live instructor — even if the child appears to be paying close attention.
Patricia K. Kuhl, a director of the Institute for Learning and Brain Sciences at the University of Washington, led a study in 2003 that compared a group of 9-month-old babies who were addressed in Mandarin by a live instructor with a group addressed in Mandarin by an instructor on a DVD. Children in a third group were exposed only to English.
“The way the kids were staring at the screen, it seemed obvious they would learn better from the DVDs,” she said. But brain scans and language testing revealed that the DVD group “learned absolutely nothing,” Dr. Kuhl said. “Their brain measures looked just like the control group that had just been exposed to English.
The only group that learned was the live social interaction group.” In other words, “it’s being talked with, not being talked at,” that teaches children language, Dr. Hirsh-Pasek said.
Similarly, perhaps the biggest threat posed
by e-books that read themselves to children, or
engage them with games, is that they could lull
parents into abdicating their educational
responsibilities, said Mr. Snow of the National
Association for the Education of Young Children.
“There’s the possibility for e-books to become the TV babysitters of this generation,” he said. “We don’t want parents to say, ‘There’s no reason for me to sit here and turn pages and tell my child how to read the word, because my iPad can do it.’ ”
But parents may find it difficult to avoid resorting to tablets. Even literacy advocates say the guidelines can be hard to follow, and that allowing limited screen time is not high on the list of parental missteps. “You might have an infant and think you’re down with the A.A.P. guidelines, and you don’t want your baby in front of a screen, but then you have a grandparent on Skype,” Mr. Snow said. “Should you really be tearing yourself apart? Maybe it’s not the world’s worst thing.”
“The issue is when you’re in the other room and Skyping with the baby cause he likes it,” he said. Even if screen time is here to stay as a part of American childhood, good old-fashioned books seem unlikely to disappear anytime soon. Parents note that there is an emotional component to paper-andink storybooks that, so far, does not seem to extend to their electronic counterparts, however engaging.
From: www.nytimes.com, OCT. 11, 2014
The word READING in the sentences “At a
time when reading increasingly means swiping
pages on a device (...), But a handful of new studies
suggest that reading to a child from an electronic
device (...), and (...) whose parents read to them
from an electronic book had lower reading
comprehension (...)” functions, respectively, as
TEXT
Clifford the Big Red Dog looks fabulous on an iPad. He sounds good, too — tap the screen and hear him pant as a blue truck roars into the frame. “Go, truck, go!” cheers the narrator. But does this count as story time? Or is it just screen time for babies? It is a question that parents, pediatricians and researchers are struggling to answer as children’s books, just like all the other ones, migrate to digital media.
For years, child development experts have advised parents to read to their children early and often, citing studies showing its linguistic, verbal and social benefits. In June, the American Academy of Pediatrics advised doctors to remind parents at every visit that they should read to their children from birth, prescribing books as enthusiastically as vaccines and vegetables.
On the other hand, the academy strongly recommends no screen time for children under 2, and less than two hours a day for older children.
At a time when reading increasingly means swiping pages on a device, and app stores are bursting with reading programs and learning games aimed at infants and preschoolers, which bit of guidance should parents heed?
The answer, researchers say, is not yet entirely clear. “We know how children learn to read,” said Kyle Snow, the applied research director at the National Association for the Education of Young Children. “But we don’t know how that process will be affected by digital technology.”
Part of the problem is the newness of the devices. Tablets and e-readers have not been in widespread use long enough for the sorts of extended studies that will reveal their effects on learning.
Dr. Pamela High, the pediatrician who wrote
the June policy for the pediatrics group, said
electronic books were intentionally not addressed.
“We tried to do a strongly evidence-based policy
statement on the issue of reading starting at a very
young age,” she said. “And there isn’t any data,
really, on e-books.”
But a handful of new studies suggest that reading to a child from an electronic device undercuts the dynamic that drives language development. “There’s a lot of interaction when you’re reading a book with your child,” Dr. High said. “You’re turning pages, pointing at pictures, talking about the story. Those things are lost somewhat when you’re using an e-book.”
In a 2013 study, researchers found that children ages 3 to 5 whose parents read to them from an electronic book had lower reading comprehension than children whose parents used traditional books. Part of the reason, they said, was that parents and children using an electronic device spent more time focusing on the device itself than on the story (a conclusion shared by at least two other studies).
“Parents were literally putting their hands over the kids’ hands and saying, ‘Wait, don’t press the button yet. Finish this up first,’ ” said Dr. Julia Parish-Morris, a developmental psychologist at Children’s Hospital of Philadelphia and the lead author of the 2013 study that was conducted at Temple University. Parents who used conventional books were more likely to engage in what education researchers call “dialogic reading,” the sort of back-and-forth discussion of the story and its relation to the child’s life that research has shown are key to a child’s linguistic development.
Complicating matters is that fewer and fewer children’s e-books can strictly be described as books, say researchers. As technology evolves, publishers are adding bells and whistles that encourage detours. “What we’re really after in reading to our children is behavior that sparks a conversation,” said Kathy Hirsh-Pasek, a professor of psychology at Temple and co-author of the 2013 study. “But if that book has things that disrupt the conversation, like a game plopped right in the middle of the story, then it’s not offering you the same advantages as an old-fashioned book.”
Of course, e-book publishers and app developers point to interactivity as an educational advantage, not a distraction. Many of those bells and whistles — Clifford’s bark, the sleepy narration of “Goodnight Moon,” the appearance of the word “ham” when a child taps the ham in the Green Eggs and Ham app — help the child pick up language, they say.
There is some evidence to bear out those claims, at least in relation to other technologies. A study by the University of Wisconsin in 2013 found that 2-year-olds learned words faster with an interactive app as opposed to one that required no action.
But when it comes to learning language, researchers say, no piece of technology can substitute for a live instructor — even if the child appears to be paying close attention.
Patricia K. Kuhl, a director of the Institute for Learning and Brain Sciences at the University of Washington, led a study in 2003 that compared a group of 9-month-old babies who were addressed in Mandarin by a live instructor with a group addressed in Mandarin by an instructor on a DVD. Children in a third group were exposed only to English.
“The way the kids were staring at the screen, it seemed obvious they would learn better from the DVDs,” she said. But brain scans and language testing revealed that the DVD group “learned absolutely nothing,” Dr. Kuhl said. “Their brain measures looked just like the control group that had just been exposed to English.
The only group that learned was the live social interaction group.” In other words, “it’s being talked with, not being talked at,” that teaches children language, Dr. Hirsh-Pasek said.
Similarly, perhaps the biggest threat posed
by e-books that read themselves to children, or
engage them with games, is that they could lull
parents into abdicating their educational
responsibilities, said Mr. Snow of the National
Association for the Education of Young Children.
“There’s the possibility for e-books to become the TV babysitters of this generation,” he said. “We don’t want parents to say, ‘There’s no reason for me to sit here and turn pages and tell my child how to read the word, because my iPad can do it.’ ”
But parents may find it difficult to avoid resorting to tablets. Even literacy advocates say the guidelines can be hard to follow, and that allowing limited screen time is not high on the list of parental missteps. “You might have an infant and think you’re down with the A.A.P. guidelines, and you don’t want your baby in front of a screen, but then you have a grandparent on Skype,” Mr. Snow said. “Should you really be tearing yourself apart? Maybe it’s not the world’s worst thing.”
“The issue is when you’re in the other room and Skyping with the baby cause he likes it,” he said. Even if screen time is here to stay as a part of American childhood, good old-fashioned books seem unlikely to disappear anytime soon. Parents note that there is an emotional component to paper-andink storybooks that, so far, does not seem to extend to their electronic counterparts, however engaging.
From: www.nytimes.com, OCT. 11, 2014
The clause “(...) when you're using an e-book”
in the passive form is
TEXT
Clifford the Big Red Dog looks fabulous on an iPad. He sounds good, too — tap the screen and hear him pant as a blue truck roars into the frame. “Go, truck, go!” cheers the narrator. But does this count as story time? Or is it just screen time for babies? It is a question that parents, pediatricians and researchers are struggling to answer as children’s books, just like all the other ones, migrate to digital media.
For years, child development experts have advised parents to read to their children early and often, citing studies showing its linguistic, verbal and social benefits. In June, the American Academy of Pediatrics advised doctors to remind parents at every visit that they should read to their children from birth, prescribing books as enthusiastically as vaccines and vegetables.
On the other hand, the academy strongly recommends no screen time for children under 2, and less than two hours a day for older children.
At a time when reading increasingly means swiping pages on a device, and app stores are bursting with reading programs and learning games aimed at infants and preschoolers, which bit of guidance should parents heed?
The answer, researchers say, is not yet entirely clear. “We know how children learn to read,” said Kyle Snow, the applied research director at the National Association for the Education of Young Children. “But we don’t know how that process will be affected by digital technology.”
Part of the problem is the newness of the devices. Tablets and e-readers have not been in widespread use long enough for the sorts of extended studies that will reveal their effects on learning.
Dr. Pamela High, the pediatrician who wrote
the June policy for the pediatrics group, said
electronic books were intentionally not addressed.
“We tried to do a strongly evidence-based policy
statement on the issue of reading starting at a very
young age,” she said. “And there isn’t any data,
really, on e-books.”
But a handful of new studies suggest that reading to a child from an electronic device undercuts the dynamic that drives language development. “There’s a lot of interaction when you’re reading a book with your child,” Dr. High said. “You’re turning pages, pointing at pictures, talking about the story. Those things are lost somewhat when you’re using an e-book.”
In a 2013 study, researchers found that children ages 3 to 5 whose parents read to them from an electronic book had lower reading comprehension than children whose parents used traditional books. Part of the reason, they said, was that parents and children using an electronic device spent more time focusing on the device itself than on the story (a conclusion shared by at least two other studies).
“Parents were literally putting their hands over the kids’ hands and saying, ‘Wait, don’t press the button yet. Finish this up first,’ ” said Dr. Julia Parish-Morris, a developmental psychologist at Children’s Hospital of Philadelphia and the lead author of the 2013 study that was conducted at Temple University. Parents who used conventional books were more likely to engage in what education researchers call “dialogic reading,” the sort of back-and-forth discussion of the story and its relation to the child’s life that research has shown are key to a child’s linguistic development.
Complicating matters is that fewer and fewer children’s e-books can strictly be described as books, say researchers. As technology evolves, publishers are adding bells and whistles that encourage detours. “What we’re really after in reading to our children is behavior that sparks a conversation,” said Kathy Hirsh-Pasek, a professor of psychology at Temple and co-author of the 2013 study. “But if that book has things that disrupt the conversation, like a game plopped right in the middle of the story, then it’s not offering you the same advantages as an old-fashioned book.”
Of course, e-book publishers and app developers point to interactivity as an educational advantage, not a distraction. Many of those bells and whistles — Clifford’s bark, the sleepy narration of “Goodnight Moon,” the appearance of the word “ham” when a child taps the ham in the Green Eggs and Ham app — help the child pick up language, they say.
There is some evidence to bear out those claims, at least in relation to other technologies. A study by the University of Wisconsin in 2013 found that 2-year-olds learned words faster with an interactive app as opposed to one that required no action.
But when it comes to learning language, researchers say, no piece of technology can substitute for a live instructor — even if the child appears to be paying close attention.
Patricia K. Kuhl, a director of the Institute for Learning and Brain Sciences at the University of Washington, led a study in 2003 that compared a group of 9-month-old babies who were addressed in Mandarin by a live instructor with a group addressed in Mandarin by an instructor on a DVD. Children in a third group were exposed only to English.
“The way the kids were staring at the screen, it seemed obvious they would learn better from the DVDs,” she said. But brain scans and language testing revealed that the DVD group “learned absolutely nothing,” Dr. Kuhl said. “Their brain measures looked just like the control group that had just been exposed to English.
The only group that learned was the live social interaction group.” In other words, “it’s being talked with, not being talked at,” that teaches children language, Dr. Hirsh-Pasek said.
Similarly, perhaps the biggest threat posed
by e-books that read themselves to children, or
engage them with games, is that they could lull
parents into abdicating their educational
responsibilities, said Mr. Snow of the National
Association for the Education of Young Children.
“There’s the possibility for e-books to become the TV babysitters of this generation,” he said. “We don’t want parents to say, ‘There’s no reason for me to sit here and turn pages and tell my child how to read the word, because my iPad can do it.’ ”
But parents may find it difficult to avoid resorting to tablets. Even literacy advocates say the guidelines can be hard to follow, and that allowing limited screen time is not high on the list of parental missteps. “You might have an infant and think you’re down with the A.A.P. guidelines, and you don’t want your baby in front of a screen, but then you have a grandparent on Skype,” Mr. Snow said. “Should you really be tearing yourself apart? Maybe it’s not the world’s worst thing.”
“The issue is when you’re in the other room and Skyping with the baby cause he likes it,” he said. Even if screen time is here to stay as a part of American childhood, good old-fashioned books seem unlikely to disappear anytime soon. Parents note that there is an emotional component to paper-andink storybooks that, so far, does not seem to extend to their electronic counterparts, however engaging.
From: www.nytimes.com, OCT. 11, 2014
In the sentence “Parents were literally
putting their hands over the kids' hands and
saying (...)” the tense of the verbs PUT and SAY is
TEXT
Clifford the Big Red Dog looks fabulous on an iPad. He sounds good, too — tap the screen and hear him pant as a blue truck roars into the frame. “Go, truck, go!” cheers the narrator. But does this count as story time? Or is it just screen time for babies? It is a question that parents, pediatricians and researchers are struggling to answer as children’s books, just like all the other ones, migrate to digital media.
For years, child development experts have advised parents to read to their children early and often, citing studies showing its linguistic, verbal and social benefits. In June, the American Academy of Pediatrics advised doctors to remind parents at every visit that they should read to their children from birth, prescribing books as enthusiastically as vaccines and vegetables.
On the other hand, the academy strongly recommends no screen time for children under 2, and less than two hours a day for older children.
At a time when reading increasingly means swiping pages on a device, and app stores are bursting with reading programs and learning games aimed at infants and preschoolers, which bit of guidance should parents heed?
The answer, researchers say, is not yet entirely clear. “We know how children learn to read,” said Kyle Snow, the applied research director at the National Association for the Education of Young Children. “But we don’t know how that process will be affected by digital technology.”
Part of the problem is the newness of the devices. Tablets and e-readers have not been in widespread use long enough for the sorts of extended studies that will reveal their effects on learning.
Dr. Pamela High, the pediatrician who wrote
the June policy for the pediatrics group, said
electronic books were intentionally not addressed.
“We tried to do a strongly evidence-based policy
statement on the issue of reading starting at a very
young age,” she said. “And there isn’t any data,
really, on e-books.”
But a handful of new studies suggest that reading to a child from an electronic device undercuts the dynamic that drives language development. “There’s a lot of interaction when you’re reading a book with your child,” Dr. High said. “You’re turning pages, pointing at pictures, talking about the story. Those things are lost somewhat when you’re using an e-book.”
In a 2013 study, researchers found that children ages 3 to 5 whose parents read to them from an electronic book had lower reading comprehension than children whose parents used traditional books. Part of the reason, they said, was that parents and children using an electronic device spent more time focusing on the device itself than on the story (a conclusion shared by at least two other studies).
“Parents were literally putting their hands over the kids’ hands and saying, ‘Wait, don’t press the button yet. Finish this up first,’ ” said Dr. Julia Parish-Morris, a developmental psychologist at Children’s Hospital of Philadelphia and the lead author of the 2013 study that was conducted at Temple University. Parents who used conventional books were more likely to engage in what education researchers call “dialogic reading,” the sort of back-and-forth discussion of the story and its relation to the child’s life that research has shown are key to a child’s linguistic development.
Complicating matters is that fewer and fewer children’s e-books can strictly be described as books, say researchers. As technology evolves, publishers are adding bells and whistles that encourage detours. “What we’re really after in reading to our children is behavior that sparks a conversation,” said Kathy Hirsh-Pasek, a professor of psychology at Temple and co-author of the 2013 study. “But if that book has things that disrupt the conversation, like a game plopped right in the middle of the story, then it’s not offering you the same advantages as an old-fashioned book.”
Of course, e-book publishers and app developers point to interactivity as an educational advantage, not a distraction. Many of those bells and whistles — Clifford’s bark, the sleepy narration of “Goodnight Moon,” the appearance of the word “ham” when a child taps the ham in the Green Eggs and Ham app — help the child pick up language, they say.
There is some evidence to bear out those claims, at least in relation to other technologies. A study by the University of Wisconsin in 2013 found that 2-year-olds learned words faster with an interactive app as opposed to one that required no action.
But when it comes to learning language, researchers say, no piece of technology can substitute for a live instructor — even if the child appears to be paying close attention.
Patricia K. Kuhl, a director of the Institute for Learning and Brain Sciences at the University of Washington, led a study in 2003 that compared a group of 9-month-old babies who were addressed in Mandarin by a live instructor with a group addressed in Mandarin by an instructor on a DVD. Children in a third group were exposed only to English.
“The way the kids were staring at the screen, it seemed obvious they would learn better from the DVDs,” she said. But brain scans and language testing revealed that the DVD group “learned absolutely nothing,” Dr. Kuhl said. “Their brain measures looked just like the control group that had just been exposed to English.
The only group that learned was the live social interaction group.” In other words, “it’s being talked with, not being talked at,” that teaches children language, Dr. Hirsh-Pasek said.
Similarly, perhaps the biggest threat posed
by e-books that read themselves to children, or
engage them with games, is that they could lull
parents into abdicating their educational
responsibilities, said Mr. Snow of the National
Association for the Education of Young Children.
“There’s the possibility for e-books to become the TV babysitters of this generation,” he said. “We don’t want parents to say, ‘There’s no reason for me to sit here and turn pages and tell my child how to read the word, because my iPad can do it.’ ”
But parents may find it difficult to avoid resorting to tablets. Even literacy advocates say the guidelines can be hard to follow, and that allowing limited screen time is not high on the list of parental missteps. “You might have an infant and think you’re down with the A.A.P. guidelines, and you don’t want your baby in front of a screen, but then you have a grandparent on Skype,” Mr. Snow said. “Should you really be tearing yourself apart? Maybe it’s not the world’s worst thing.”
“The issue is when you’re in the other room and Skyping with the baby cause he likes it,” he said. Even if screen time is here to stay as a part of American childhood, good old-fashioned books seem unlikely to disappear anytime soon. Parents note that there is an emotional component to paper-andink storybooks that, so far, does not seem to extend to their electronic counterparts, however engaging.
From: www.nytimes.com, OCT. 11, 2014