Linking apparent position to population receptive field estimates using a visual field projection model

Schneider, Marian; Marquardt, Ingo; Sengupta, Shubharthi; Martino, Federico De; Goebel, Rainer

doi:10.32470/ccn.2019.1185-0

Cited by 1 publication

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“…This constant offset in the direction of the internal motion was similar in magnitude to that seen for static Gabors. In contrast to the double drift, the effects of this smaller position shift can be observed in V1 using fMRI (Schneider, Marquardt, Sengupta, de Martino, & Goebel, 2019;Whitney et al, 2003), although it is paradoxically in the opposite direction from the perceived shift.…”

Section: Discussionmentioning

confidence: 80%

Attentional tracking takes place over perceived rather than veridical positions

Maechler

Cavanagh

Tse

2021

Atten Percept Psychophys

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Illusions can induce striking differences between perception and retinal input. For instance, a static Gabor with a moving internal texture appears to be shifted in the direction of its internal motion, a shift that increases dramatically when the Gabor itself is also in motion. Here, we ask whether attention operates on the perceptual or physical location of this stimulus. To do so, we generated an attentional tracking task where participants (N = 15) had to keep track of a single target among three Gabors that rotated around a common center in the periphery. During tracking, the illusion was used to make three Gabors appear either shifted away from or toward one another while maintaining the same physical separation. Because tracking performance depends in part on target to distractor spacing, if attention selects targets from perceived positions, performance should be better when the Gabors appear further apart and worse when they appear closer together. We find that tracking performance is superior with greater perceived separation, implying that attentional tracking operates over perceived rather than physical positions.

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Section: Discussionmentioning

confidence: 80%