Multiple components of surround modulation in primary visual cortex: Multiple neural circuits with multiple functions?

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Publication Type pre-print
School or College School of Medicine
Department Ophthalmology
Creator Angelucci, Alessandra
Other Author Nurminen, Lauri
Title Multiple components of surround modulation in primary visual cortex: Multiple neural circuits with multiple functions?
Date 2014-01-01
Description The responses of neurons in primary visual cortex (V1) to stimulation of their receptive field (RF) are modulated by stimuli in the RF surround. This modulation is suppressive when the stimuli in the RF and surround are of similar orientation, but less suppressive or facilitatory when they are cross-oriented. Similarly, in human vision surround stimuli selectively suppress the perceived contrast of a central stimulus. Although the properties of surround modulation have been thoroughly characterized in many species, cortical areas and sensory modalities, its role in perception remains unknown. Here we argue that surround modulation in V1 consists of multiple components having different spatio-temporal and tuning properties, generated by different neural circuits and serving different visual functions. One component arises from LGN afferents, is fast, untuned for orientation, and spatially restricted to the surround region nearest to the RF (the near-surround); its function is to normalize V1 cell responses to local contrast. Intra-V1 horizontal connections contribute a slower, narrowly orientation-tuned component to near-surround modulation, whose function is to increase the coding efficiency of natural images in manner that leads to the extraction of object boundaries. The third component is generated by topdown feedback connections to V1, is fast, broadly orientation-tuned, and extends into the far-surround; its function is to enhance the salience of behaviorally relevant visual features. Far- and near-surround modulation, thus, act as parallel mechanisms: the former quickly detects and guides saccades/attention to salient visual scene locations, the latter segments object boundaries in the scene.
Type Text
Publisher Elsevier
Volume 104
First Page 47
Last Page 56
Language eng
Bibliographic Citation Nurminen, L., Angelucci, A. (2014). Multiple components of surround modulation in primary visual cortex: Multiple neural circuits with multiple functions?. Vision Research, 104, 47-56.
Rights Management (c) Elsevier ; Authors manuscript from Nurminen, L., Angelucci, A. (2014). Multiple components of surround modulation in primary visual cortex: Multiple neural circuits with multiple functions?. Vision Research, 104, 47-56. http://dx.doi.org/ 10.1016/j.visres.2014.08.018.
Format Medium application/pdf
Format Extent 2,590,294 bytes
Identifier uspace,19301
ARK ark:/87278/s6v444b9
Setname ir_uspace
Date Created 2015-03-02
Date Modified 2021-05-06
ID 712844
Reference URL https://collections.lib.utah.edu/ark:/87278/s6v444b9
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