Contrast sensitivity and behavioural evidence for lateral inhibition in octopus.

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dc.contributor.author Nahmad-Rohen, Luis en
dc.contributor.author Vorobiev, Mikhail en
dc.date.accessioned 2019-10-02T00:44:34Z en
dc.date.issued 2019-05 en
dc.identifier.issn 1744-9561 en
dc.identifier.uri http://hdl.handle.net/2292/48335 en
dc.description.abstract Behavioural contrast sensitivity in Octopus tetricus was measured in the range of 0.05-12 cycles per degree (cpd) using a fixation reflex. We show that the contrast sensitivity reaches its maximum (between 1 and 4%) at 0.3 cpd, and decreases to approximately half of the maximum value at the lowest spatial frequency. Reduction of sensitivity at low spatial frequency is a signature of lateral inhibition in visual systems. In vertebrates and insects, lateral inhibition helps to overcome the bottleneck of encoding information into spikes. In octopus, photoreceptors generate spikes themselves and are directly connected to the brain through their axons. Therefore, the neural processing occurring in the octopus brain cannot help overcome the bottleneck of encoding information into spikes. We conclude that, in octopus, either the lateral inhibition occurs in the brain after information has been encoded into spikes, or photoreceptors inhibit each other. This is the first time behavioural contrast sensitivity has been measured in a cephalopod. en
dc.format.medium Print en
dc.language eng en
dc.relation.ispartofseries Biology letters en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Brain en
dc.subject Animals en
dc.subject Vertebrates en
dc.subject Contrast Sensitivity en
dc.subject Octopodiformes en
dc.title Contrast sensitivity and behavioural evidence for lateral inhibition in octopus. en
dc.type Journal Article en
dc.identifier.doi 10.1098/rsbl.2019.0134 en
pubs.issue 5 en
pubs.begin-page 20190134 en
pubs.volume 15 en
dc.rights.holder Copyright: The author en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Research Support, Non-U.S. Gov't en
pubs.subtype research-article en
pubs.subtype Journal Article en
pubs.elements-id 774876 en
pubs.org-id Medical and Health Sciences en
pubs.org-id Optometry and Vision Science en
dc.identifier.eissn 1744-957X en
pubs.record-created-at-source-date 2019-05-16 en
pubs.dimensions-id 31088281 en


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