Date: Wednesday, 28.06.2023 17:00 CET
Location: Building S1|03 Room 223
Abstract:
As a model of interaction between hierarchically organized streams of cortical processing we investigated the interaction between V1 and PMLS, an MT analogue in the cat visual cortex. We have investigated these connections in terms of functional anatomy, its role in neurophysiological and behavioral consequences. We could show that in particular the feedback connections from PMLS back to V1 displayed a high degree of functional specificity, appear to have different functionality roles based on the different laminar origin of these connections and that they crucially influenced the shaping of complex motion representation in V1. Moreover, we noticed that in absence of this feedback the oscillatory activity in V1 was strongly impaired in gamma-band oscillations. In behavioral experiments, it is known that in the absence of PMLS activity, a phenomenon called “visual hemineglect” occurs. Exploring the neurophysiological basis of these neglect phenomena in awake behaving animals, we could show, that stimulus related activity in V1, resembled the activity in absence of stimulus in the absence of intact feedback activity. All this points towards a revision of our current view of network interactions in the series of sensory processing.
