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The decision to move: response times, neuronal circuits and sensory memory in a simple vertebrate

Roberts, Alan, Borisyuk, Roman, Buhi, Edgar, Ferrario, Andrea, Koutsikou, Stella, Li, Wen-Chang, Soffe, Stephen R. (2019) The decision to move: response times, neuronal circuits and sensory memory in a simple vertebrate. Proceedings of the Royal Society B: Biological Sciences, 286 (1899). ISSN 0962-8452. (doi:10.1098/rspb.2019.0297) (KAR id:73347)

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All animals use sensory systems to monitor external events and have to decide whether to move. Response times are long and variable compared to reflexes, and fast escape movements. The complexity of adult vertebrate brains makes it difficult to trace the neuronal circuits underlying basic decisions to move. To simplify the problem, we investigate the nervous system and responses of hatchling frog tadpoles which swim when their skin is stimulated. Studying the neuron-by-neuron pathway from sensory to hindbrain neurons, where the decision to swim is made, has revealed two simple pathways generating excitation which sums to threshold in these neurons to initiate swimming. The direct pathway leads to short, and reliable delays like an escape response. The other includes a population of sensory processing neurons which extend firing to introduce noise and delay into responses. These neurons provide a brief, sensory memory of the stimulus, that allows tadpoles to integrate stimuli occurring within a second or so of each other. We relate these findings to other studies and conclude that sensory memory makes a fundamental contribution to simple decisions and is present in the brainstem of a basic vertebrate at a surprisingly early stage in development.

Item Type: Article
DOI/Identification number: 10.1098/rspb.2019.0297
Uncontrolled keywords: decisions, locomotion, response times, sensory memory
Divisions: Faculties > Sciences > Medway School of Pharmacy
Depositing User: Styliani Koutsikou
Date Deposited: 03 Apr 2019 11:28 UTC
Last Modified: 05 Sep 2019 13:17 UTC
Resource URI: (The current URI for this page, for reference purposes)
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