Sensory Systems | Cognitive Neuroscience
The time-dilation aftereffect depends on orientation and eye of origin
Laura Ortega*, Emmanuel Guzman-Martinez, Marcia Grabowecky, Satoru Suzuki
*Corresponding author: Laura Ortega
Department of Psychology and Interdepartmental Neuroscience Program, Northwestern University, Evanston, IL, USA
F1000Posters 2011, 2: 613 (poster) [ENGLISH]
Poster [505.32 KB]
Presented at
Vision Sciences Society 11th Annual Meeting 2011,
6 - 11 May 2011, 33.546
Several seconds of adaptation to a flickered (5 Hz) stimulus makes a subsequently presented brief static stimulus appear longer in duration. What causes this time-dilation aftereffect?
Our experiments demonstrate that the time-dilation aftereffect is significantly reduced by 90° and 45° orientation changes, suggesting the involvement of lower-level visual neurons (orientation-tuning bandwidths are approximately 25–40° in V1, 35–75° in V4, and 70° in IT). Furthermore, the time-dilation aftereffect is significantly reduced when the adaptor and test stimuli are presented to different eyes than when they are presented to the same eye. Because eye preferences are strong in V1 but diminish in high-level visual areas, the specificity for eye of origin corroborates the involvement of low-level visual neurons. Further, because people are generally unaware of the eye-of-origin information, cognitive processing is unlikely to have mediated this specificity.
Main conclusion: Taken together, our results suggest that flicker adaptation of low-level visual neurons contributes to expanding the perceived duration of a subsequently presented static stimulus.
Funding/Competing Interests: No relevant conflicts of interest declared.
No relevant competing interests disclosed.
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