CBMM | Quest: Brains, Minds, and Machines Seminar Series: How fly neurons compute the direction of visual motion
, Max-Planck-Institute of Neurobiology, Martinsried, Germany
Date: Tuesday, March 22, 2022
Time: 2:00 PM to 3:00 PM Note: all times are in the Eastern Time Zone
Location: This seminar talk will be hosted remotely via Zoom
Event Type: Seminar
Host: Prof. Tomaso A. Poggio
Contact: Kris Brewer, firstname.lastname@example.org
Speaker URL: https://www.bi.mpg.de/2402854/borst-page
TALK: CBMM | Quest: Brains, Minds, and Machines Seminar Series: How fly neurons compute the direction of visual motion
Abstract: Detecting the direction of image motion is important for visual navigation, predator avoidance and prey capture, and thus essential for the survival of all animals that have eyes. However, the direction of motion is not explicitly represented at the level of the photoreceptors: it rather needs to be computed by subsequent neural circuits, involving a comparison of the signals from neighboring photoreceptors over time. The exact nature of this process represents a classic example of neural computation and has been a longstanding question in the field. Only recently, much progress has been made in the fruit fly Drosophila by genetically targeting individual neuron types to block, activate or record from them. Our results obtained this way demonstrate that the local direction of motion is computed in two parallel ON and OFF pathways. Within each pathway, a retinotopic array of four direction-selective T4 (ON) and T5 (OFF) cells represents the four Cartesian components of local motion vectors (leftward, rightward, upward, downward). Since none of the presynaptic neurons is directionally selective, direction selectivity first emerges within T4 and T5 cells. Our present research focuses on the cellular and biophysical mechanisms by which the direction of image motion is computed in these neurons.
Please click the link below to join the webinar:
AI & Machine Learning, Computational Biology, Graphics & Vision, Human-Computer Interaction
Created by Kathleen Sullivan at Tuesday, March 15, 2022 at 4:26 PM.