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Spectral Signatures of Feedforward and Recurrent Circuitry in Monkey Area MT

Solomon, SS; Morley, JW; Solomon, SG; (2017) Spectral Signatures of Feedforward and Recurrent Circuitry in Monkey Area MT. Cerebral Cortex , 27 (5) pp. 2793-2808. 10.1093/cercor/bhw124. Green open access

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Abstract

Recordings of local field potential (LFP) in the visual cortex can show rhythmic activity at gamma frequencies (30-100 Hz). While the gamma rhythms in the primary visual cortex have been well studied, the structural and functional characteristics of gamma rhythms in extrastriate visual cortex are less clear. Here, we studied the spatial distribution and functional specificity of gamma rhythms in extrastriate middle temporal (MT) area of visual cortex in marmoset monkeys. We found that moving gratings induced narrowband gamma rhythms across cortical layers that were coherent across much of area MT. Moving dot fields instead induced a broadband increase in LFP in middle and upper layers, with weaker narrowband gamma rhythms in deeper layers. The stimulus dependence of LFP response in middle and upper layers of area MT appears to reflect the presence (gratings) or absence (dot fields and other textures) of strongly oriented contours. Our results suggest that gamma rhythms in these layers are propagated from earlier visual cortex, while those in the deeper layers may emerge in area MT.

Type: Article
Title: Spectral Signatures of Feedforward and Recurrent Circuitry in Monkey Area MT
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/cercor/bhw124
Publisher version: https://doi.org/10.1093/cercor/bhw124
Language: English
Additional information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Cerebral Cortex following peer review. The version of record, Solomon, SS; Morley, JW; Solomon, SG; (2016) Spectral Signatures of Feedforward and Recurrent Circuitry in Monkey Area MT. Cerebral Cortex, is available online at: http://dx.doi.org/10.1093/cercor/bhw124.
Keywords: LFP, area MT, gamma, motion processing, visual pathways
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Experimental Psychology
URI: https://discovery.ucl.ac.uk/id/eprint/1478275
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