Approach angles in the experimental trials.

<p>Group averages (thick curves) and individual averages (thin curves) in the increase condition (blue curves) and in the decrease condition (red curves), for novices, trainees, and certified pilots. The curves show the approach angles as compared to those in the control trials. The vertical dashed lines indicate the beginning and the end the manipulation of the simulated eye height. Asterisks on the thick blue curves indicate that, at those points, single-tailed <i>t</i> tests comparing the corrected individual-average approach angles in the increase and decrease conditions were significant (<i>p</i> < .05).