Suresh Krishna

18 janvier 2018


Cognitive Neuroscience Lab, German Primate Center (DPZ), Göttingen, Germany

Topics in Hearing and Vision

invité par Guilhem Ibos

Abstract : I will first briefly present some of my physiology and modeling work on the processing of temporally modulated sounds, to spark interest in potential collaborations. I will then switch topics to talk about the brain mechanisms of active vision. How do humans and rhesus macaques stitch together different views across saccadic eye-movements, and what are some of the cerebral cortical mechanisms that underlie this behavior ? I will describe some of our recent findings in this area based on behavioral measurements in humans, computational modeling and single-neuron recordings from the cerebral cortex in awake, behaving rhesus macaques. We have recently provided the first empirical evidence for the role of inhibitory mechanisms in the selection of targets for visual attention and saccadic eye-movements. We have also shown that visual attention shifts are rapid and well-synchronized with saccades. The locations, but not the features of attended stimuli are remapped across saccades, so that these attended stimuli can be tracked and processed rapidly after each saccade. We find evidence for the presence of fast sequences of eye-movements during naturalistic active vision : these saccade sequences are driven by visual information that is rapidly and accurately transferred across saccades. In addition to effects on neuronal firing-rate, the variability of firing and the temporal patterns of firing are also affected by visual attention. Our work has been used by modelers (in collaboration with us) to identify novel principles of neural circuit organization.

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