Motion detection in flies: parametric control over ON-OFF pathways.
Microscopic illumination of two neighbouring photoreceptor cells within a single ommatidium induces a strong sequence-dependent response in a directionally selective, motion-sensitive neuron. The response is characterized by a strong facilitation in the preferred direction and a weaker inhibition in the reverse direction. The data suggest that for each direction of apparent movement the signal from an ON-OFF pathway is released into the neuron via a parametric control mechanism which is activated by an adjacent channel.
D000818:Animals; D001696:Biomechanical Phenomena; D005260:Female; D005724:Ganglia / Q000166:cytology; D006793:Houseflies / Q000502:physiology*; D009039:Motion Perception / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology*