Fig. 6. Performance varies with head orientation and with which speaker presented the sound stimulus. (A) Mean percentage of trials in which subjects 392, 000, 325 were able to fly to the correct response perch. (B–E) Performance levels observed for each subject as a function of head orientation and which speaker presented the sound stimulus. Solid lines with no symbols represent performance levels observed when stimuli were played from either speaker. Lower traces in B–E depict sample sizes without respect to which speaker presented the sound stimulus. Dashed lines indicate 65% and 75% correct performance levels.