Although the phrase “constructive feedback” is slowly being
relegated to a euphemism for what’s articulated on voice-themed reality shows,
the importance of providing accurate information about performance is
understood by educators and learning scientists. One reason startups that make
use of blended learning generate so much excitement is that adaptive learning
platforms have the potential to provide each student with detailed feedback
tailored to their unique strengths and weaknesses.
exactly what kind of feedback -- including the level of detail, tone, and
timing -- is most influential, is the subject of much research.
For example, while researchers have established that it’s
important for feedback on a problem to contain the correct answer, they’ve
failed to conclusively show that further elaboration is beneficial. A group of psychologists
led by Duke’s Andrew Butler believed these counter-intuitive results could be
explained by the fact that the same questions tend to be asked on the pre- and
post-tests. If participants simply had to retain the correct answer, any
additional information would be superfluous.
Butler's team decided to design an
experiment where the post-test included new questions that required
transferring knowledge gleaned from the initial feedback to a new context. The
results, which will appear in a forthcoming issue of the Journal of Educational Psychology, suggest their suspicions were
accurate. When participants couldn’t merely memorize the pre-test answer the
extra explanatory feedback led to better performance. It appears that, up to a
point, more is in fact better.
Of course, not all feedback needs to be detailed to be
effective. In a study published in the January issue of Computers and Education, a team of researchers from the University
of Canterbury and the University of Illinois-Chicago attempted to isolate
the impact of positive feedback – relatively nondescript mid-exercise
comments such as “good job” and “exactly.”
The experiments used a program
designed to teach coding in the SQL programming language. One group used the
standard program that only gave negative feedback after incorrect answers. A second
group used a modified version that was designed to also offer positive feedback.
It did this when students entered a correct answer, but were likely to be
uncertain about it.
When the researchers analyzed the performance of the two
groups they found no significant difference in the number of problems solved.
However, the group that received positive feedback solved the problems in half
the time it took the group that received only negative feedback. The results
suggest that by reducing uncertainty the positive feedback was able to
accelerate the learning process.
If future research confirms that positive feedback works best in moments
of uncertainty, then identifying these moments ahead of time could become an
increasingly important part of developing computer-based lessons.
One perpetual problem with computer feedback is that it
lacks the emotional element of human interaction. But even if computers never
match the kind words of a teacher, might there be ways to move beyond cold font
on a computer screen? A 2010 study
involving over 170 sixth graders found that when a program used a
human voice recording for feedback instead of static emoticons, it led to
higher ratings of social presence, more intrinsic motivation, and better
performance on math problems. A human voice still can’t match the presence of a
person, but it is promising that that the voice appeared to move outcomes off
an inferior, completely inhumane baseline. The door is clearly open for future
researchers to explore ways that sound and video can make feedback more
Computer-based instruction still has a way to go, but research
on feedback illustrates its potential. The ability to provide elaboration and
positive encouragement at all the right moments would give computers an
instructional advantage over humans. And who knows, perhaps science fiction
writers were prophetic and someday we’ll find a way for computers to generate copious
amounts of humanity (for better or worse.)