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eNeuro. 2019 Apr 9;6(2). pii: ENEURO.0480-18.2019. doi: 10.1523/ENEURO.0480-18.2019. eCollection 2019 Mar-Apr.

Synaptic Basis for Contrast-Dependent Shifts in Functional Identity in Mouse V1.

Author information

1
National Vision Research Institute, Australian College of Optometry, Carlton, Victoria 3053, Australia.
2
Department of Optometry and Vision Sciences, University of Melbourne, Parkville, Victoria 3010, Australia.
3
University of Texas Austin, Centre for Learning and Memory, Austin, TX 78712.
4
Department of Physiology, Monash University, Clayton, Victoria 3800, Australia.

Abstract

A central transformation that occurs within mammalian visual cortex is the change from linear, polarity-sensitive responses to nonlinear, polarity-insensitive responses. These neurons are classically labelled as either simple or complex, respectively, on the basis of their response linearity (Skottun et al., 1991). While the difference between cell classes is clear when the stimulus strength is high, reducing stimulus strength diminishes the differences between the cell types and causes some complex cells to respond as simple cells (Crowder et al., 2007; van Kleef et al., 2010; Hietanen et al., 2013). To understand the synaptic basis for this shift in behavior, we used in vivo whole-cell recordings while systematically shifting stimulus contrast. We find systematic shifts in the degree of complex cell responses in mouse primary visual cortex (V1) at the subthreshold level, demonstrating that synaptic inputs change in concert with the shifts in response linearity and that the change in response linearity is not simply due to the threshold nonlinearity. These shifts are consistent with a visual cortex model in which the recurrent amplification acts as a critical component in the generation of complex cell responses (Chance et al., 1999).

KEYWORDS:

complex cell; in vivo whole-cell recording; phase sensitivity; primary visual cortex; visual system

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