Abstract：
:Changes in target visibility may be produced by additional stimulus elements at adjacent locations. Such contextual effects may reflect lateral interactions of stimulus representations in early cortical areas. It has been reported that the organization of orientation preference found in primates and cats visual cortex differs from that found in rodents, suggesting functional distinctions across species. In order to examine effects of lateral interactions at a perceptual level, contrast sensitivity in rats was measured for Gabor patches masked by two additional patches. Rats responded to target onset, and perceptual indices were based upon reaction time distributions across levels of luminance contrast. It was found that contrast sensitivity of targets without lateral masks corresponded to levels previously reported. For all measurements, the presence of sustained lateral masks systematically reduced sensitivity to targets, demonstrating interference by adjacent elements across levels of contrast. Effects of mask orientation or separation were not observed. These results may reflect reported non-systematic topography of orientation tuning across the cortex in rodents. Results suggest that intrinsic lateral connections in early processing areas play a minimal role in stimulus integration for rats.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Kurylo DD,Yeturo S,Lanza J,Bukhari Fdoi
10.1016/j.bbr.2017.07.046subject
Has Abstractpub_date
2017-09-29 00:00:00pages
1-7eissn
0166-4328issn
1872-7549pii
S0166-4328(17)30573-9journal_volume
335pub_type
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