Date of Original Version

4-15-2015

Type

Thesis

Abstract or Description

Rapid processing of scenes has been shown to be facilitated by the processing of low spatial frequency (LSF) components before that of high spatial frequency (HSF) components. It has been been proposed that magnocellular pathways carrying low spatial frequencies provide an initial ‘gist’ of a scene, which is filled in using higher spatial frequencies along the the ventral stream. This study seeks to determine how performance on a six-way scene categorization task varies as a function of spatial frequency and image presentation duration. Across six categories of scenes, a low-high continuum of spatial frequencies, and a short 50ms presentation duration and longer 100ms one, we measured subjects reaction times and accuracies in categorizing scenes. Accuracy was equivalent for HSF-filtered scenes and LSF-filtered and this was true for the shorter and longer duration conditions. However, accuracy was significantly better for HSF-filtered images of forests at 100ms versus at 50ms presentation. Taken together, these results suggest that in addition to LSF information, HSF components of scenes may also facilitate rapid scene processing for some types of scenes.

Comments

Advisors: Marlene Behrmann, Elissa Arminoff

Center for the Neural Basis of Cognition

Embargo Date

2015

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