To identify the most effective way for medical students to interact with
a browser-based learning module on the symptoms and neurological underpinnings
of stroke syndromes, this study manipulated the way in which subjects interacted
with a graphical model of the brain and examined the impact of functional
changes on learning outcomes. It was hypothesized that behavioral interactions
that were behaviorally more engaging and which required deeper consideration of
the model would result in heightened cognitive interaction and better learning
than those whose manipulation required less deliberate behavioral and cognitive
processing. One hundred forty four students were randomly assigned to four
conditions whose model controls incorporated features that required different
levels of behavioral and cognitive interaction: Movie (low behavioral/low
cognitive, n = 40), Slider (high behavioral/low cognitive,
n = 36), Click (low behavioral/high cognitive,
n = 30), and Drag (high behavioral/high cognitive,
n = 38). Analysis of Covariates (ANCOVA) showed that
students who received the treatments associated with lower cognitive
interactivity (Movie and Slider) performed better on a transfer task than those
receiving the module associated with high cognitive interactivity (Click and
Drag, partial eta squared = .03). In addition, the students in the high
cognitive interactivity conditions spent significantly more time on the stroke
locator activity than other conditions (partial eta squared = .36). The results
suggest that interaction with controls that were tightly coupled with the model
and whose manipulation required deliberate consideration of the model’s
features may have overtaxed subjects’ cognitive resources. Cognitive
effort that facilitated manipulation of content, though directed at the model,
may have resulted in extraneous cognitive load, impeding subjects in recognizing
the deeper, global relationships in the materials. Instructional designers must,
therefore, keep in mind that the way in which functional affordances are
integrated with the content can shape both behavioral and cognitive processing,
and has significant cognitive load implications.