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Age-Group Differences in Saccadic Interference

Department of Psychology, University of Kentucky, Lexington.

Address correspondence to Lawrence R. Gottlob, 201 Kastle Hall, Lexington, KY 40506-0044. E-mail: gottlob{at}uky.edu

We examined age-group differences in a saccadic interference task, which requires that participants execute a saccade (eye movement) toward an abrupt-onset visual target presented to the right or left of fixation. On some trials, we imposed diffuse interference by bilateral (top and bottom) flashes of light presented 20 to 210 ms after target onset. When the flashes followed the cue at shorter intervals, time to execute a saccade was slowed relative to no-flash trials. This slowing was greater and sustained over a larger cue–flash interval for older participants than for the young participants. The results indicate that, when diffuse distractors are used, older adults are more susceptible to saccade disruption than are young adults.