Structure of the visual surround in a patch of primary visual cortex

Summary

Date: 
May 8, 2019 - 12:00pm - 1:00pm
Location: 
Northwest Building, Room 243
About the Speaker
Name: 
Abhinav Grama
Speaker Title: 
Postdoctoral Fellow
Speaker Affiliation: 
Cox Lab

V1 neurons show contextual modulation of responses to stimuli presented in their classical receptive fields (RFs) based on what is present in the surround. Termed extra-classical receptive field effects, the most popular is surround suppression or end-stopping where stimuli extending beyond the classical RF suppress the activity of the neuron. How this modulation is mediated is still largely an unanswered question with likely candidates being feedback from neighboring V1 neurons or feedback from V2 and higher visual areas which survey a larger fraction of the visual scene. In our study we try to address the source of feedback from the visual surround by using optical tools we developed to simultaneously image local V1 activity and either local V1 synapses or feedback synapses from V2 (area LM in rodents).