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Proportional Cerebellum Size Predicts Fear Habituation in Chickens
IFM-Biology, Linköping University, Linköping, Sweden.
IFM-Biology, Linköping University, Linköping, Sweden.
IFM-Biology, Linköping University, Linköping, Sweden.
IFM-Biology, Linköping University, Linköping, Sweden.
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2022 (English)In: Frontiers in Physiology, E-ISSN 1664-042X, Vol. 13, article id 826178Article in journal (Refereed) Published
Abstract [en]

The cerebellum has a highly conserved neural structure across species but varies widely in size. The wide variation in cerebellar size (both absolute and in proportion to the rest of the brain) among species and populations suggests that functional specialization is linked to its size. There is increasing recognition that the cerebellum contributes to cognitive processing and emotional control in addition to its role in motor coordination. However, to what extent cerebellum size reflects variation in these behavioral processes within species remains largely unknown. By using a unique intercross chicken population based on parental lines with high divergence in cerebellum size, we compared the behavior of individuals repeatedly exposed to the same fear test (emergence test) early in life and after sexual maturity (eight trials per age group) with proportional cerebellum size and cerebellum neural density. While proportional cerebellum size did not predict the initial fear response of the individuals (trial 1), it did increasingly predict adult individuals response as the trials progressed. Our results suggest that proportional cerebellum size does not necessarily predict an individual's fear response, but rather the habituation process to a fearful stimulus. Cerebellum neuronal density did not predict fear behavior in the individuals which suggests that these effects do not result from changes in neuronal density but due to other variables linked to proportional cerebellum size which might underlie fear habituation.

Place, publisher, year, edition, pages
2022. Vol. 13, article id 826178
Keywords [en]
behavioral predictability, domestication, emergence test, isotropic fractionation, neural density
National Category
Behavioral Sciences Biology
Identifiers
URN: urn:nbn:se:du-39866DOI: 10.3389/fphys.2022.826178ISI: 000765066500001PubMedID: 35250629Scopus ID: 2-s2.0-85125852826OAI: oai:DiVA.org:du-39866DiVA, id: diva2:1645251
Funder
Swedish Research Council Formas, 2019-01508EU, European Research Council, FERALGEN 772874Swedish Research CouncilCarl Tryggers foundation Linköpings universitetAvailable from: 2022-03-16 Created: 2022-03-16 Last updated: 2024-01-17Bibliographically approved

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