Direction Selectivity in Primary Visual Cortex Using Massive Intracortical Connections

Humbert Suarez, Christof Koch, Rodney Douglas

NeurIPS 1994 pp. 3-10

/neurips/1994/suarez1994neurips-direction/

Abstract

Almost all models of orientation and direction selectivity in visual cortex are based on feedforward connection schemes, where genicu(cid:173) late input provides all excitation to both pyramidal and inhibitory neurons. The latter neurons then suppress the response of the for(cid:173) mer for non-optimal stimuli. However, anatomical studies show that up to 90 % of the excitatory synaptic input onto any corti(cid:173) cal cell is provided by other cortical cells. The massive excitatory feedback nature of cortical circuits is embedded in the canonical microcircuit of Douglas &. Martin (1991). We here investigate ana(cid:173) lytically and through biologically realistic simulations the function(cid:173) ing of a detailed model of this circuitry, operating in a hysteretic mode. In the model, weak geniculate input is dramatically ampli(cid:173) fied by intracortical excitation, while inhibition has a dual role: (i) to prevent the early geniculate-induced excitation in the null di(cid:173) rection and (ii) to restrain excitation and ensure that the neurons fire only when the stimulus is in their receptive-field. Among the

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Text

Suarez et al. "Direction Selectivity in Primary Visual Cortex Using Massive Intracortical Connections." Neural Information Processing Systems, 1994.

Markdown

[Suarez et al. "Direction Selectivity in Primary Visual Cortex Using Massive Intracortical Connections." Neural Information Processing Systems, 1994.](https://mlanthology.org/neurips/1994/suarez1994neurips-direction/)

BibTeX

@inproceedings{suarez1994neurips-direction,
  title     = {{Direction Selectivity in Primary Visual Cortex Using Massive Intracortical Connections}},
  author    = {Suarez, Humbert and Koch, Christof and Douglas, Rodney},
  booktitle = {Neural Information Processing Systems},
  year      = {1994},
  pages     = {3-10},
  url       = {https://mlanthology.org/neurips/1994/suarez1994neurips-direction/}
}