A Developmental Model of Hemispheric Asymmetry of Spatial Frequencies.

Ben CipolliniUniversity of California, San Diego
Garrison CottrellUniversity of California, San Diego

Abstract

Lateralization touches virtually every function we think makes us human and interacts fundamentally with development. Here we connect lateralized function to anatomical asymmetries, and connect those anatomical asymmetries to temporal asym- metries in development. Our differential encoding (DE) model (Cipollini, Hsiao, & Cottrell, 2012; Hsiao, Cipollini, & Cottrell, 2013; Hsiao, Shahbazi, & Cottrell, 2008) shows that lateralization in visual processing of spatial frequencies can be explained by a postulated asymmetry in the spatial spread of connections within retinotopic visual cortex. Here, we present three new modeling results supporting our previous conclusions. First, we show that our model results persist when trained on natural images, warped to match physical distortions of V1, showing that greater biological realism does not diminish our results. Second, we show that the hypothesized anatomical asymmetry can emerge from normal development, due to 1) the known temporal asymmetry in developmental pruning, coupled with 2) known acuity changes. This results in the two hemispheres being trained with images of different spatial frequency con- tent. Third, results from this developmental model suggest that the LH is not specialized for HSF processing; rather, the RH is specialized for LSF processing to the detriment of HSF processing.

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A Developmental Model of Hemispheric Asymmetry of Spatial Frequencies. (0.9 MB)



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