How exogenous and endogenous attention affect the vertical meridian asymmetry across spatial frequency and eccentricity

Jigo, Michael; Tavdy, Daniel; Carrasco, Marisa

doi:10.1167/jov.21.9.2385

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All observers, except the authors, were naïve to the purpose of the study and were paid $12/hr. Data and code pertaining to the experiment are available on the OSF repository ( https://osf.io/gvkdh/ ; Jigo et al, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

Cortical magnification eliminates differences in contrast sensitivity across but not around the visual field

Jigo

Tavdy

Himmelberg

et al. 2023

eLife

View full text Add to dashboard Cite

Human visual performance changes dramatically both across (eccentricity) and around (polar angle) the visual field. Performance is better at the fovea, decreases with eccentricity, and is better along the horizontal than vertical meridian and along the lower than the upper vertical meridian. However, all neurophysiological and virtually all behavioral studies of cortical magnification have investigated eccentricity effects without considering polar angle. Most performance differences due to eccentricity are eliminated when stimulus size is cortically magnified (M-scaled) to equate the size of its cortical representation in primary visual cortex (V1). But does cortical magnification underlie performance differences around the visual field? Here, to assess contrast sensitivity, human adult observers performed an orientation discrimination task with constant stimulus size at different locations as well as when stimulus size was M-scaled according to stimulus eccentricity and polar angle location. We found that although M-scaling stimulus size eliminates differences across eccentricity, it does not eliminate differences around the polar angle. This finding indicates that limits in contrast sensitivity across eccentricity and around the visual field are mediated by different anatomical and computational constraints.

show abstract

Section: Methodsmentioning

confidence: 99%