Sparse but specific temporal coding by spikes in an insect sensory-motor ocellar pathway.

The Journal of Experimental Biology
Peter J Simmons, Rob R de Ruyter van Steveninck

Abstract

We investigate coding in a locust brain neuron, DNI, which transforms graded synaptic input from ocellar L-neurons into axonal spikes that travel to excite particular thoracic flight neurons. Ocellar neurons are naturally stimulated by fluctuations in light collected from a wide field of view, for example when the visual horizon moves up and down. We used two types of stimuli: fluctuating light from a light-emitting diode (LED), and a visual horizon displayed on an electrostatic monitor. In response to randomly fluctuating light stimuli delivered from the LED, individual spikes in DNI occur sparsely but are timed to sub-millisecond precision, carrying substantial information: 4.5-7 bits per spike in our experiments. In response to these light stimuli, the graded potential signal in DNI carries considerably less information than in presynaptic L-neurons. DNI is excited in phase with either sinusoidal light from an LED or a visual horizon oscillating up and down at 20 Hz, and changes in mean light level or mean horizon level alter the timing of excitation for each cycle. DNI is a multimodal interneuron, but its ability to time spikes precisely in response to ocellar stimulation is not degraded by additional excitation. We suggest...Continue Reading

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Citations

May 28, 2013·Trends in Neurosciences·Tom BadenLeon Lagnado
Sep 29, 2011·Arthropod Structure & Development·Willi RibiJochen Zeil
Aug 11, 2011·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Peter J Simmons
Nov 14, 2020·Nature Reviews. Neuroscience·Mary T Joy, S Thomas Carmichael

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