Neural mechanisms, subserving directional selectivity of movement in the optic lobe of the fly

Directionally Selective Motion Detection by Insect Neurons

“…;Strausfeld 1984, this Vol.). In fact, small-field OS cells are to be found distally to HI (in the medulla: McCann and Dill 1969;Mimura 1971Mimura , 1972Collett and King 1975;DeVoe and Ockleford 1976;DeVoe 1980) but they do not necessarily drive the OS lobula plate heurons as there exist other, direct output pathways from the medulla to the brain (rev. Strausfeld 1976).…”

Properties of individual movement detectors as derived from behavioural experiments on the visual system of the fly

“…Although there is cursory evidence for local neurones in the fly's visual system which might play a role in the motion detection process (Mimura 1972;DeVoe and Ockleford 1976;DeVoe 1980), these cells are relatively small and hard to record from long enough to allow a systematic analysis of their properties. It is, however, interesting to note that the response of some of these units to a moving sine-wave grating is modulated in a way as expected from the detector theory (DeVoe 1980).…”

Synaptic rectification model equivalent to the correlation-type movement detector

“…Such a separation of EMDs into two classes, ON-and OFF-EMDs, is an essential feature of the E-I model. Second, Mimura (1972) and Schuling et al (1989) noted that both excitatory (facilitatory) and inhibitory lateral interactions are involved in the response of directionally-selective neurons of flies, although some other authors concluded that either excitatory (Riehle and Franceschini 1984) or inhibitory (Schmid and Biilthoff 1988) interactions play major roles to produce directionalselectivity. A notable feature of the E-I model is that its ON-detector produces phase-dependent output, as does the correlation model (Reichardt 1987;Reichardt and Egelhaaf 1988), whereas its ON-OFF detector produces phase-independent output.…”