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DTSTART:20180325T030000
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DTSTART:20181028T020000
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DTSTAMP:20260404T203420Z
UID:5b055ce29111d256594506@ist.ac.at
DTSTART:20180607T110000
DTEND:20180607T120000
DESCRIPTION:Speaker: Alexander Borst\nhosted by Maximilian Jösch\nAbstract
 : Detecting the direction of image motion is important for visual navigati
 on as well as predator\, prey and mate detection\, and thus essential for 
 the survival of all animals that have eyes. However\, the direction of mot
 ion is not explicitly represented at the level of the photoreceptors: it r
 ather needs to be computed by subsequent neural circuits\, involving a com
 parison of the signals from neighboring photoreceptors over time. The exac
 t nature of this process represents a classic example of neural computatio
 n and has been a longstanding question in the field. Only recently\, much 
 progress has been made in the fruit fly Drosophila by genetically targetin
 g individual neuron types to block\, activate or record from them. Our res
 ults obtained this way indicate that the local direction of motion is comp
 uted in two parallel ON and OFF pathways. Within each pathway\, a retinoto
 pic array of four direction-selective T4 (ON) and T5 (OFF) cells represent
 s the four Cartesian components of local motion vectors. Since none of the
 ir presynaptic neurons turned out to be directionally selective\, directio
 n selectivity first emerges within T4 and T5 cells. Our present research f
 ocuses on the cellular and biophysical mechanisms by which this important 
 visual cue is computed in these neurons.
LOCATION:Mondi Seminar Room 2\, Central Building\, ISTA
ORGANIZER:rsix@ist.ac.at
SUMMARY:Alexander Borst: How do Neurons Compute the Direction of Motion?
URL:https://talks-calendar.ista.ac.at/events/1257
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