Responses of the teleostean nucleus isthmi to looming objects and other moving stimuli

Visual Neuroscience
Shawn P Gallagher, D P Northmore

Abstract

Visually evoked extracellular neural activity was recorded from the nucleus isthmi (NI) of goldfish and bluegill sunfish. When moving anywhere within the right eye's visual field, three-dimensional checkered balls or patterns on a computer screen evoked bursts of spikes in the left NI. Object motion parallel to the longitudinal body axis gave responses that habituated markedly upon repetition, but movement into recently unstimulated regions of the visual field gave vigorous responses. Thus, while NI's response is not visuotopic, its habituation is. An object approaching the animal's body generated a rising spike density, whereas object recession generated only a transient burst. During the approach of a checkered stimulus ball, average NI spike density rose linearly as the ball-to-eye distance decreased and at a rate proportional to the ball's speed (2.5-30 cm/s). Increasing ball size (2.2-9.2 cm) did not affect the rate of activity rise at a given speed, but did increase overall activity levels. NI also responded reliably to expanding textures of fixed overall size. The results suggest that NI signals changes in motion of objects relative to the fish, and estimates the proximity of approaching objects.

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Citations

Dec 19, 2008·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Yoshifumi Yamawaki, Yoshihiro Toh
Sep 10, 2010·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·John R GrayR Meldrum Robertson
Oct 23, 2010·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Debajit SahaRalf Wessel
Mar 12, 2011·Annual Review of Neuroscience·Haleh Fotowat, Fabrizio Gabbiani
Aug 12, 2006·Progress in Neurobiology·Masae Kinoshita, Etsuro Ito
Oct 18, 2016·Current Opinion in Neurobiology·Ana G Pereira, Marta A Moita
May 7, 2011·Brain, Behavior and Evolution·Yong-Jun LiuBing Li
May 11, 2012·Journal of Neurophysiology·Glyn A McMillan, John R Gray
Jun 18, 2020·Frontiers in Neural Circuits·Santiago Otero CoronelVioleta Medan

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