Tuesday, July 19, 2016

Having the Option to Do Nothing Increases Commitment


We often assume that giving people the chance to choose what they are going to do will increase their motivation to do it.  One reason why many colleges give their students so much autonomy is with the belief that if students have selected the classes they take they will put more effort into those classes than if the classes were assigned to them. 

Of course, when you are actually engaged in a task (like taking a class), the alternatives you have in front of you are to work on the task or to do something else entirely and give up on the task.  So, perhaps it would be helpful to get people to explicitly decide that they prefer the task to doing nothing. 

This possibility was explored in a paper in the March, 2014 issue of Psychological Science by Rom Schrift and Jeffry Parker. 

In one study, they gave participants a choice between one of two word searchers in which they had to find as many words as possible in a grid.  They would be paid based on the number of items they found.  One search involved finding actors names, while the other involved finding capitol cities.  A second group got the same two choices as well as the option not to participate in the task.  Nobody chose not to participate.  A third group was given a choice of three puzzles, one of which had unfamiliar terms (famous ballet dancers) that no participant selected.  This last condition was there to control for the possibility that having three options rather than two mattered.

The participants given a choice between two or three puzzles spent about 5 minutes working on the puzzle they selected.  Those who were given the option not to participate spent about 7 minutes working on their selected puzzle.  So, explicitly choosing to do something rather than not to do it greatly increased the amount of time people spent on the task. 

A second study demonstrated that the option to participate has to be given when people are choosing the task to perform.  In this study, some participants were first told they could opt in to doing a second study as part of an experiment.  After opting in (which everyone did), they selected one of two tasks.  A second group was given a choice between the two tasks or the option not to participate.  Everyone in this group also agreed to participate.  In this study, the two options (a perception task and a cognition task) were vague enough that all participants actually performed the same task.  Participants who had to choose to do a task rather than not to do one spent more time on the task and performed better than those who first opted in and then selected a task.

Finally, a third study found that choosing to perform a task rather than doing nothing only influenced the particular task selected.  In this study, some people chose one of two tasks to perform, while a second group chose a task, but had the option to do nothing (which nobody picked).  Before doing the task they selected, they were given a second task in which they had to find as many differences between a pair of pictures as possible.  People spent the same amount of time on this extraneous task regardless of the choice condition they were in.  But, then, participants given the option to do nothing spent more time on the experimental task than those just given a choice between two experimental tasks.

Putting all of this together, there seems to be real value in getting people to commit to doing a particular task by having them choose explicitly to do that task rather than doing nothing.  This advantage reflects that stopping a task is essentially choosing to do nothing rather than doing the task.  Of course, future research must explore whether the influence of opting against doing nothing has a long-term influence on motivation.  The experimental tasks in this paper are all short.  It is not clear whether opting to take classes rather than not to take classes would affect a student’s motivation for an entire semester.

Wednesday, June 29, 2016

Creating Personalized Practice for Students


For a few decades now, educators have suggested that computers would vastly improve our ability to teach students.  The assumption has been that with computers we would be able to transport students to places they could not go on their own, allow them to communicate with people around the globe, and get more personalized instruction.

So far, the influence of computers in education has been mixed.  Computers clearly allow access to a much larger library of materials than students would were able to get before the internet.  In addition, students can view interesting videos that bring more content than the filmstrips and videos that were the norm in the past. 

However, computers have had a downside as well.  The internet provides a lot of distraction that leads students to try to multitask in ways that hamper learning.  Video lectures (like MOOCs) have not yet lived up to the hype.  It is just hard to watch a lecture on a screen.   And there have been few successful methods for personalizing instruction to individual student needs.

This issue of personalized practice was explored in a paper by Robert Lindsey, Jeffery Shroyer, Harold Pashler, and Michael Mozer in the March, 2014 issue of Psychological Science. 

They compared three methods for helping eighth-grade students to learn Spanish vocabulary.  For each of these methods, all students studied for the same amount of time. 

One group of students just practiced the most recent lesson each week for 10 weeks.  This process is similar to what many students do now when their weekly quizzes focus on the most recent material.  A second group got a generic kind of practice that spaced practice out over weeks in which they were given the chance to study both material from the current lesson and from the previous lesson. 

A third group used a more complex technique to guess what material each student was most likely to be just about to forget.  This technique used a student’s performance each week to estimate their overall ability to remember vocabulary, the difficulty of particular items (judged by how well students in general were able to learn those items) and how often they had seen those items previously.  Using this technique, students spent most of their time each week on the new items from the current lesson, but then received a smattering of older items to help them with older information that they would be likely to forget.

Students got a test at the end of the semester and another test after a four-week break as they started the next semester.  On both tests, students given the personalized training regimen did much better than those who either studied just the words from the current week or those who studied the words from the previous week and those from the current week.  The biggest benefit for the personalized training came for items that were learned early in the semester.  Students given this training were much less likely to forget those items than those given the other two techniques.

This finding suggests that when students are learning information that requires a lot of practice, computers may be used to individualize practice for the needs of particular students.  Of course, computers are just enhancing a piece of the learning here.  Picking up a new language requires learning vocabulary, but it also requires learning to actually communicate.  This technique helps with memorization, but not with the use of the new language.

One concern that I have with this technique, though, is that students need to learn material, but they also need to learn to study effectively.  That is, students need to learn that the reason that they succeed with this new technique is because it finds difficult items from the past that they are just about to forget and gets them to study those items.  These students will not always have a computer in front of them helping them to figure out what material to study.  So, they need to learn to apply some of these strategies on their own in order to maximize their ability to learn in the future.   

Wednesday, June 22, 2016

Studying Learning Using Video Games


A subtheme in this blog has been the influence of video game play on people’s behavior.  There is an ongoing debate about both the potential negative impact of playing games (such as increases in aggression or lower grades) as well as positive influences (like an increase in prosocial behavior after playing games with positive messages and an increase in speed of decision making).

Video games themselves can also be a great testing ground for theories of learning.  That was the approach taken in a fascinating paper in the February, 2014 issue of Psychological Science by Tom Stafford and Michael Dewar.

They were interested in testing a fascinating theory about learning new skills.  The idea is that any time you are learning something new, there is a tradeoff between exploiting past knowledge and exploring new strategies.  The proposal was that people who succeed best in learning new skills start by exploring a range of strategies.  This exploration may cause them to do well when they hit on a potentially good strategy and to do poorly when they try something that does not work well. Then, when people find a good strategy, they should exploit it and keep improving their skill.  Those who settle on a strategy too quickly (and so they start exploiting early) may end up picking one that is far from optimal, and so they will do more poorly in the long run.

They worked with a game designer to create an on-line game called Axon.  The game involves making simple selections of targets on a screen.  Some of the dots are colored, and the colored dots have different influences.  Some colors are better to hit than others.  So, there is some strategy, but the strategies are not complex and are mostly focused on which color dots should be selected. 

During the data collection period, the game was played over 3.5 million times by over 850,000 players.  Most of the analyses were done on the 45,672 individuals who played the game 10 or more times.

Before addressing the key experimental question, it was important for the researchers to make sure that the data gave sensible results.  So, they started by verifying that two classic phenomena from learning studies occurred in this data set.  The first was the observation that performance improves with practice.  Looking at those people who played at least 10 games, it was clear that the more games people played, the better they got. 

Second, it is well known that when people space their practice out over time, their performance is better than when it is concentrated together.  There are several reasons for the improvement for practice that is spaced out over time.  One is that spaced practice allows information being learned to become associated with many different contexts. The second is that sleep improves skilled performance, and the more times people play and the more time that elapses between attempts, the more likely that people will sleep between attempts at the game.

Consistent with the prior work on this topic, people who concentrated their game play together did worse at the game than those who spread their play out over time.

Because the game yields sensible data, the researchers could look at the more complex question relating early strategies to later performance.  The researchers looked at the degree of variability in the scores over the first five games people played.  The more variable the scores, the more strategies people were likely to have tried early on.  They looked at how this variability was related to the high score people achieved on the next five games they played. 

The more variable people’s scores in the first 5 games, the higher their best score tended to be in the next five games.  That is, exploring a range of initial strategies allowed participants to do better than selecting a single strategy early on and sticking with it.  

There are two interesting things about this project.

First, it is a great example of using the internet to look at learning in a large number of people.  Most research studies done at universities involve a small number of participants who perform a small number of trials on a task.  This game is still fairly simple, but it allowed a large number of people to play it.

Second, these findings suggest that it is valuable to try a number of different strategies in any task before settling on one.  People who did this naturally in the game were more successful than those who did not.  An interesting follow up study would explore whether people who are instructed to try different strategies also do better than those who are instructed to select a strategy and stick with it.  That would disentangle whether these results reflect that people who are better at video games are those who also try more strategies, or whether anyone can improve by trying more strategies. 

Tuesday, May 24, 2016

Kids Want to Learn About Kinds, Not Individuals


By the time you are an adult, you know a lot about the world.  You know that dogs bark, that computers allow you to communicate with people around the planet, that airplanes fly you from city to city, and that water boils at 100 degrees Celsius.  You also know a lot about individuals you have met.  You know your mother’s maiden name (which is handy when you need to open a bank account).  You know your best friend’s favorite color, the toy your aunt’s dog likes to play with, and exact way you need to unlatch the gate at your grandparents’ house. 

Your knowledge about individuals is useful for helping you to interact with specific situations in the world.  Knowing your best friend’s favorite color can help you buy a gift for her birthday.  Your knowledge about kinds of things (like dogs in general) can help you to predict what you should expect when you encounter a new dog.  Ultimately, you need to learn information about kinds of things in the world as well as information about the specific individuals you encounter.

An interesting paper by Andrei Cimpian and JoAnn Park in the February, 2014 issue of the Journal of Experimental Psychology: General examined what 4- and 5-year-old kids do when they are given a choice to learn about a particular individual or a kind in general.  

In one experiment, children sat with an experimenter who brought pictures of several unfamiliar animals (like a pangolin and a tarsier).  For half the children, the experimenter said that she was an expert and knew a lot about these animals.  For the other half of the children, the experimenter said she did not know much about the animals, but could guess some facts about them.

The experimenter showed a picture of an animal and said that she could tell the child a fact about that particular animal or about that kind of animal in general.  Children would let the experimenter know what kind of fact they wanted, and they would be given a fact.  Children were able to learn 3 facts for each picture and there were 4 pictures for a total of 12 trials.

When the experimenter said she was just guessing, children had no preference for getting facts about individuals or kinds.  This result makes sense, because the facts the child is getting are equally useless.  When the experimenter said she knew a lot about the animals, though, the children wanted information about the kind of animal much more often (64% of the time) than they wanted information about the individual.

One possibility is that children just want information that applies to more individuals, and that is why they choose to get facts about the kind.  In a second study, some children were given the chance to get a fact about the animal pictured or about several other specific animals that were not in the picture.  In this condition, children had no preference for getting a fact about one animal or a fact about several.  

Finally, a third study repeated the first experiment with familiar animals (like sharks, ants, and crickets).  Once again, children had no particular preference for facts about individuals or kinds when the experimenter said she didn’t know anything about the animals, but preferred to get facts about the kind in general when the experimenter said she was an expert.

This result suggests that when young children are around people with expertise, they want to learn about categories of objects.  This bias helps them to learn facts that will help them to deal with new things that they encounter.  This finding also argues against another way that children could learn about the world.  Children could learn lots of facts about individuals and then try to generalize those facts to apply to all members of the kind.  Instead, children prefer to learn about facts that apply to the kind. 

Wednesday, April 27, 2016

People Differ in Their Ability to Suppress Memories


Your ability to recall a word or event involves mechanisms that enhance the item you want to remember and suppress competitors.  It is like a bunch of 6-year-olds trying to be picked for the kickball team.  The kids who jump the highest and shove the other kids hardest are the ones who are selected.

Psychologists use the word inhibition to refer to the suppression of items in memory.  The inhibitory mechanisms in the brain involve circuits in the frontal lobes.  

A fascinating observation over the past decade is that these inhibitory mechanisms in the brain can cause subtle variability in people’s heart rate through the vagus nerve.  If you measure someone’s resting heart rate and measure the amount of variability in the time between beats, that variation may serve as a marker of the strength of people’s ability to inhibit information in memory.

An interesting paper by Brandon Gillie, Michael Vasey, and Julian Thayer in the February, 2014 issue of Psychological Science explored this possibility.  

They used a memory test called the Think/No Think procedure first developed by Michael Anderson and his colleagues.  In this procedure, people learn a list of associations between words.  The list might include items like “tape-radio.” 

After practicing these associations 3 times, the Think/No Think procedure begins.  The first word of a pair (tape) is presented in green or red (or is not presented at all).  If it is presented in green, then people are instructed to think about the associated word for 4 seconds.  If it is presented in red, then people are instructed to avoid thinking about the associated word for those 4 seconds.  This procedure is repeated 16 times, so that people get a lot of practice either thinking about the association or not thinking about it.  

There are two tests of recall.  People see the first word of the pair and are asked to recall the second.  In a second test, they see the first word of the pair and the first letter of the second word and are asked to recall the second word. 

Finally, all participants had their heart rate collected using an electrocardiogram (ECG).  The ECG output was analyzed to determine the variability from beat-to-beat.

The standard finding with this procedure (which is also obtained in this study) is that (on average) people recall about 10% more of the associations when they see them in the Think condition than in the No Think condition.   

The group of participants was split into one group with relatively high variability in heart rate and a second group with relatively low variability in heart rate. 

Having low heart rate variability is associated with having low inhibitory control in memory.  That group showed very little difference between the Think and No Think conditions of the study.  They remembered the associated words equally well regardless of whether they were instructed to think about them or not to think about them.

Having high heart rate variability is associated with high inhibitory control.  That group showed a big difference between the Think and No Think conditions.  They remembered many more words when they were encouraged to think about them than when they were encouraged not to think about them.

The ability to inhibit unwanted items in memory is valuable.  Research suggests that this ability degrades with age, which is one reason why older adults often have trouble with memory.  So, having a physiological measurement that relates to this degree of inhibitory control is useful.
As valuable as the ability to inhibit information can be, it is important to recognize that the No Think condition does not eliminate people’s ability to recall the associated words.  Creativity requires being able to think about information that does not seem obviously related to the current situation.  Juxtaposing different information sources is a great way to look for a novel solution to a problem.  As a result, we want to have good inhibitory mechanisms, but not ones that work too well.

Monday, April 18, 2016

Beliefs About Time Affect Savings


It is hard to save money, because we are wired to prefer to do things that are good for us in the short-term over those that are good for us in the long-term.  No matter how much we believe that our future self might want to buy a nice car, send our kids to college, or eat after we retire, there are always shiny things that we would like to buy right now that seem to have a priority over our future.  

So, how can we help people to save more money?

A fascinating paper by Leon Tam and Utpal Dholakia in the February, 2014 issue of Psychological Science suggests that people’s beliefs about time may have a big impact on how much they save.

The dominant way that many people (particularly from Western cultures) tend to think about time is as a line.  Individuals occupy a point on that line that is the present.  Behind them is the past, and ahead of them is the future.  Because the future is far away, many approaches to help people save more money are designed to make people feel like the future is nearer to the present than it seems.  The idea is that when people realize that they have to help our future selves, they will be more likely to put away money to help them achieve their future goals.

These techniques often fail, however.  People recognize that their future selves may need help, but they are also optimistic that they will be making more money in the future and so they will be in a better position to save money later than they are now.

Tam and Dholakia point out that people also think about time in terms of cycles.  People know that the days of the week repeat, and that the seasons come each year.  When people focus on these cycles, they may realize that their lives don’t change much from cycle to cycle.  Consequently, if people don’t save money now, why should they believe that they will be in a different situation the next time this cycle happens?  The researchers argue that getting people to focus on the cyclic nature of time may get people to increase the amount they save, because they realize that the future will not be that much different than the present.

In one study, adults between the ages of 19 and 55 were placed in one of three experimental conditions.  

One group was told to think about time as a cycle and to recognize that life’s cycles repeat themselves.  They were told that if they do not save money now, they are unlikely to be in a different situation the next time this cycle came around.

A second group was told to think about time as a line.  Their goal was to save money to put their future selves in a better position to achieve their goals.  

A third group got no specific instructions about time.

Then, the participants predicted how much money they would save over the next two weeks.  Participants were then contacted after two weeks and stated how much they had saved in that period.

Participants in the control condition predicted they would save $133, and actually saved $81.  Those told to think about time as a line did not do much better.  They predicted they would save $140, and actually saved $118.  The group given instructions to think about time as a cycle did much better.  They predicted they would save $233 and they actually saved $216.  

Another study by these authors extended the work in two ways.  First, participants were either told to think of time as a line or as a cycle.  They made predictions both for how much they would save this month and also how much they would save a year from now.  Participants told to think of time as a cycle predicted they would save more this month than those who were told to think of time as line.  This replicates the previous study.  However, those told to think of time as a line predicted they would save more money a year from now than those who were told to think of time as a cycle.  That is, participants who thought of time as a line were more optimistic about their future ability to save money than those who thought of time as a cycle.  

Finally, everyone was asked questions about their ability to make plans to save money.  The participants asked to think about time as a cycle exhibited more confidence in their plan to save money than those asked to think about time as a line.

What does all of this mean?

We are often optimistic about what the future holds.  In the future, we believe that we will make more money, be better at resisting temptation; we assume we will eat better and exercise more often.  In reality, though, the future is typically much like the present.  There are always temptations to spend money, eat too much and skip exercise.

Focusing on the cycles of life helps people to be more realistic that the future will be like the present.   Achieving future goals requires acting now. 

Wednesday, April 13, 2016

Young Infants Learn By Doing


The brain is an extraordinarily complex organ that we are struggling to understand scientifically. To help us understand the way the brain works, we often use the most complex machines of an era to give us insight into what the brain is doing.  And starting in the 1950’s, the most complex machine we had was the computer.  

One influence of this computer metaphor for the mind is that it has emphasized the information that is processed in the brain over the relationship between mind and body.  After all, computers have poor bodies.  They have a keyboard and mouse as a sensory system and a display and internet connection as ways of acting on the world around it.  As a result, most research in psychology focuses on how the brain processes particular kinds of information without much focus on how the body influences that thought.

There are some streams of research that buck this trend.  In research on adults, there is work on situated cognition that explores how the environment affects the way people think.  There are also studies in embodied cognition that examine how body and mind interact.

Over the years, there has also been work on how the body influences learning in infants and children.  In my last blog entry, for example,  I talked about how experience moving influences children’s curiosity about heights.

A fascinating paper in the February, 2014 issue of Child Development by Sarah Gerson and Amanda Woodward examines how 3-month-olds learn about other people’s goals from their own actions.

If you have ever spent any time with a 3-month-old, then you know that they are not particularly coordinated.  Jessica Sommerville, Amanda Woodward, and Amy Needham developed an ingenious method for looking at actions in 3-month-olds (reported in a paper in the journal Cognition in 2005).  They attached mittens with Velcro on them to infants’ hands.  Then, the infants could reach out and move toys that also had Velcro on them.

In Gerson and Woodward’s study, all of the infants had a chance to sit with the toys for a few minutes without the mittens.  Then, some infants had the mittens put on, and they reached out and played with the toys for a few minutes.  For these infants, playing with the toy generally meant moving it back-and forth across the table.  A second group of infants was matched with the infants from the first group.  For each infant in the second group, the experimenter mimicked the actions of the infant using Velcro gloves, so that this infant got to watch something similar to what the first infant did.  That provides a control condition in which the infants are exposed to the actions without actually performing the actions themselves.

After this initial exposure, infants were tested.  It is hard to test 3-month-olds, because they cannot speak or understand much language.  Instead, researchers typically use a looking procedure.  

In this study, the two toys that were used in the first part of the study were placed on a stage.  A gloved hand reached out and picked up one of the toys.  This event was presented several times until the infants stopped looking at it.  This decrease in looking time is called habituation and is used as a measure that the children can predict what is going to happen.

Then, the positions of the two toys were switched.  So, the one on the left is now on the right and vice versa.  Now, two types of test trials were given.  In one type of test trial, the hand reached out and grabbed the toy that was now on the left.  In this case, the hand performed the same action, but the outcome was different.  In the other type of test trial, the hand picked the same object that it selected before.  In this case, the movement was different (because the hand had to reach all the way to the right), but the outcome was the same (because the same object that was touched earlier was selected again).  

The experimenters measured how long infants looked at each type of test.  The longer infants look, the more interested they are in that outcome, generally because that outcome is different from what they expected.

The infants who watched someone else acting on the toys did not look reliably longer at either type of event. Those infants who acted on the toys themselves looked for a longer time at the event with a different outcome than at the event with the same outcome.  That is, by playing with the toys, infants seemed to learn that other people often direct their actions at particular outcomes rather than just making particular movements.

The infants learned something very specific from this experience, though.  A third group of infants played with the toys using the mittens, but then the test trials involved a different set of toys than the ones they played with.  This group also did not look reliably longer at either type of test event.  That is, the infants learned only about outcomes involving the specific toys they played with.

What does all of this mean?

One way that infants learn about what other people want to do is by learning about how they perform actions in the world.  As they learn that their actions can be directed toward particular outcomes, they also learn that other people may act to bring about particular outcomes.    

However, it also appears that this learning is very conservative.  That is, infants start by learning about their interactions with particular objects.  It is valuable to keep from generalizing too far from early experience, because there are likely to be many exceptions to the early rules that infants learn.

More broadly, this research demonstrates the importance of acting on the world when learning.  Too often, even adults try to learn passively by listening to others and reading superficially.  It is important to engage with the world when learning rather than just treating the process of learning as if we were computers that were being fed information.