Development / Aging
dmunger | January 14, 2009Can you tell if these two faces are the same or different?
How about these?
Or these?
If you're like most adults, it will be easier for you to identify different adult faces compared to the infant faces in the second example, and even the small children's faces in the third example.
This makes some sense, since most people don't spend much time around a wide variety of infants. Even a new parent typically only sees one or two infants at a time. The infants you see out in public are usually wrapped up and often are difficult to see. Most of us see more children than babies, but unless…
dmunger | January 12, 2009Take a look at this video made by fellow ScienceBlogger Dr. Isis. She's talking with her son, a toddler who adorably mimics her as she says very complicated words such as "Adventures in Ethics and Science" and "Wackaloon" (but sadly, not "Cognitive Daily"):
It's cute, but it's difficult to say whether Dr. Isis is really talking with her child. The difficulty babies have pronouncing words has led many parents to suspect they might be able to communicate better with their children using hand signs.
Last week we talked about a study suggesting that teaching babies even a few signs like those…
dmunger | January 5, 2009Baby sign language is all the rage these days. Upscale day-care centers and nanny services promote it as a better way of understanding what babies want. Babies have been known to reliably produce signs as young as 5.5 months, and studies have shown that they reliably produce signs significantly earlier than spoken words. As we've reported here, there is no evidence that teaching sign language delays spoken language development.
But is formal sign training effective? Some studies about baby sign language have been quite informal, with parents and caregivers inventing makeshift signs to "talk"…
dmunger | November 17, 2008One of things I was taught over and over again when I was in education school was the importance of getting parents involved in kids' learning. If you get the parents on your side, my professors insisted, then you're going to be much more able to get through to the students. I didn't last long enough as a teacher to see how well this advice worked, but as a parent, I've certainly experienced the process from the other end. From an early age, our kids were given "homework" that they couldn't possibly do without the help of their parents.
Sometimes it seemed as if these assignments were really…
dmunger | November 12, 2008When Jim and Nora were toddlers, they were huge fans of everything Disney. Here they're wearing their Disney pajamas as they play next to their Seven Dwarves figurines, underneath their TV, which was frequently used to watch Disney videos. We even took them to Disney World, where they had an absolute blast, but turned out to be afraid of life-sized Disney characters (but that's a story for another day).
While we didn't let them watch Disney movies whenever they wanted, we did allow it once or twice a week, and even built up a large collection of videos, which we still use to entertain younger…
dmunger | October 22, 2008Nora was an excellent talker, starting at a very young age, but that didn't mean that she couldn't express herself in other ways. Here, for example, she points to a the item she wants. It's entirely possible that she didn't yet know the word "stick," but she was still quite able to express her desire.
But what happens if a child is particularly successful at expressing her needs using gestures? Does development of spoken language suffer? One approach to this problem is to look language development in cultures that tend to use more gestures. Many studies have confirmed the "stereotype" that…
dmunger | October 1, 2008When Jim was 12 or 13, he seemed to want to watch almost every R-rated movie that came out. PG-13 movies were okay, and PG and G-rated movies were beneath his dignity. Was he simply interested in these movies because they were forbidden (as we contended), or was he somehow more drawn to the content of movies that happened to carry an R rating (as he insisted)?
To further complicate matters, there are separate ratings systems for TV, movies, video games, music, and even web sites. With such an array of ratings systems, are parents actually aware of what each rating means?
There's been…
dmunger | September 24, 2008When Jimmy and Nora were toddlers, we bought them great little plastic scooters to ride around the house. They were the perfect size for a small child. Yet Jimmy preferred to ride around on a plastic garbage truck instead, despite the fact that there was no steering wheel and the "seat" wasn't nearly as comfortable, at least to our adult eyes:
We figured this behavior was just one of Jimmy's unique quirks. It didn't really bother us, except for the knowledge that we could have saved 20 bucks on the "real" scooter if we'd only known he would end up preferring the garbage truck.
In 2003, Judy…
dmunger | September 17, 2008One of Jimmy's favorite toys as a toddler was a simple little bucket of blocks. There were three shapes: a rectangular prism, a triangular prism, and a cylinder. The bucket's lid had three holes: a square, a triangle, and a circle (The picture at right was the only one I could find online -- this sort of toy has gotten much fancier in recent years).
For an adult, it's a simple matter to properly sort the shapes by placing them into the corresponding holes, but for a toddler, it's a real challenge. It took months before Jim was able to put any of the blocks through the holes, despite…
dmunger | August 27, 2008"Impossible objects" like the etchings of M.C. Escher have fascinated adults for centuries. You can't help but stare and wonder at a drawing like this, which seems to defy the laws of nature:
The drawing seems strange to us because our visual system tells us that when an object or part of an object occludes another, it's in front. Since the parts of the cube are all connected, it's clear that the vertical bar in the "back" of the cube shouldn't be in front of any other bars.
Some research has suggested that young babies don't have the same ability as adults to determine how close objects…
dmunger | July 28, 2008One of the key components of "normal" child development is social competence. We expect kids to become gradually better at behaving respectfully towards peers, to comply with requests made by others, to understand the thoughts of others, to play together with kids and adults, to sustain attention, and to be motivated to learn. But what makes the difference between a child who becomes socially competent and one who doesn't? Obviously there are some risk factors, such as whether they have autism, whether both parents are present in the household, and the education and poverty level of the…
dmunger | July 21, 2008A number of studies have found that older adults aren't as good at certain visual tasks compared to younger adults. Mental rotation, for example, is both slower and less accurate. But other studies have found that for certain types of mental rotation, older adults do just as well as younger adults. The dividing line, these researchers argued, was based on whether the viewer was rotating or the objects themselves were rotating.
So in a classic mental rotation task like Shepard and Metzler's, older adults don't do as well, but in many other tasks, their performance isn't much different from…
dmunger | June 12, 2008Boundary extension -- misremembering the boundaries of a scene as wider than they really are -- has been observed in adults as old as 84 and children as young as 6. But for kids much younger than 6, the phenomenon becomes quite difficult to study. How do you ask a 6-month-old whether the picture they're looking at has the same borders as one they saw a few minutes ago? You can't ask them to draw the picture for you -- they can barely sit up, let alone hold a pencil.
Yet the development of boundary extension is an important aspect of the study of vision. Do babies experience the phenomenon…
dmunger | May 28, 2008Inspired by this post, we've decided to devote a week to the analysis of studies from the history of psychology.
Today we consider the work of Millicent Washburn Shinn, one of the first women admitted to the University of California, Berkeley (in 1874), and the first to earn a Ph.D. there. In 1890, her niece Ruth was born, and Shinn spent hours carefully observing the child's every behavior. This "large mass of data" became the basis for a book that was welcomed by the scholars of the day, The Biography of a Baby, which, while not the first of its kind, certainly was one of the most thorough…
dmunger | May 20, 2008How do you raise "good kids"? It's one of the questions that plagues parents even before their kids are born. Although everyone's child can't be above average, we all want our kids to be nice to others, to "get along" in the world. But kids don't necessarily cooperate. Babies scream, pull hair, defecate and urinate where they're not supposed to. Toddlers throw fits in the middle of supermarkets, and older children lie to us and steal from each other. How do we keep them from becoming delinquents, convicts, or worse?
Unfortunately a lot of the research suggests that parents don't actually have…
dmunger | May 13, 2008Jim was an early, confident walker. Greta likes to say that he didn't learn to walk, he went straight to running. By the time he was about 16 months old, he could already outrun his already-pregnant mother.
Nora, on the other hand, was a late, tentative walker. She took her first steps at around 12 months, and still wasn't very confident as a walker at 18 months. In this photo, at 17 months, she still clings to their toy kitchen set for balance.
But I've just finished reading a fascinating study suggesting that at 14 months, when both of them were walking -- Jim with confidence, and Nora…
dmunger | May 7, 2008Ask almost anyone whether willfully deceiving another person -- lying -- is wrong, and they'll say it is. But probe a little deeper and most people will say there are some instances where lying is okay: lying to prevent a crime or an injustice is acceptable, just not lying for personal gain. Parents teach their kids that lying is wrong, and punish them for telling lies.
I can still remember the shock when my parents "lied" about my sixth birthday (which was a day away) at an ice-cream parlor so I could get a free sundae. But eventually, at some point, most American kids end up telling lies to…
dmunger | May 1, 2008One of the amazing things about learning language is that children rarely hear language sounds in ideal acoustic environments. Maybe other people are talking in the background, or the dishwasher is running, or the TV is on. Yet somehow children they learn words just the same. By the time we're adults, we've become experts at filtering out irrelevant sounds and patching together meaning out of the cacophony of everyday life.
As one example, listen to this short clip of me saying the word "dinosaur" three times.
I edited the "s" sound out of the first "dinosaur," so you can clearly hear me…
dmunger | April 7, 2008The fact that infants are able to learn language without any help from adults can sometimes seem almost miraculous. Not only do children learn to speak and understand language completely on their own, active teaching of language skills seems to make almost no difference in their ability to talk.
One of the first difficulties when learning a language solely from listening to spoken language is determining where one word ends and the next one begins. Native speakers of a language typically leave no audible space between words at all. Even "motherese" doesn't leave any space between words -- if…
dmunger | March 17, 2008There is a growing body of evidence that very young children -- too young even to talk -- still know plenty of words. When our kids were very young, it was quite clear that they knew the meanings of many more words than they could actually produce. When they couldn't speak at all, they understood words like "Mommy," "bottle," and "diaper." When they were older and could say those words but not complete sentences, they understood more complicated phrases like "go into the kitchen and bring me your sister's sippy cup."
But is there something special about words? Or could babies learn to…