The link between relative brain size and cognitive ageing in female guppies (Poecilia reticulata) artificially selected for variation in brain size

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Boussard, AnnikaStockholms universitet,Zoologiska institutionen (författare)

The link between relative brain size and cognitive ageing in female guppies (Poecilia reticulata) artificially selected for variation in brain size

Artikel/kapitelEngelska2021

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Elsevier BV,2021
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:su-192026
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-192026URI
https://doi.org/10.1016/j.exger.2020.111218DOI

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Språk:engelska
Sammanfattning på:engelska

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Anmärkningar

Cognitive ageing is the general process when certain mental skills gradually deteriorate with age. Across species, there is a pattern of a slower brain structure degradation rate in large-brained species. Hence, having a larger brain might buffer the impact of cognitive ageing and positively affect survival at older age. However, few studies have investigated the link between relative brain size and cognitive ageing at the intraspecific level. In particular, experimental data on how brain size affects brain function also into higher age is largely missing. We used 288 female guppies (Poecilia reticulata), artificially selected for large and small relative brain size, to investigate variation in colour discrimination and behavioural flexibility, at 4-6, 12 and 24 months of age. These ages are particularly interesting since they cover the life span from sexual maturation until maximal life length under natural conditions. We found no evidence for a slower cognitive ageing rate in large-brained females in neither initial colour discrimination nor reversal learning. Behavioural flexibility was predicted by large relative brain size in the youngest group, but the effect of brain size disappeared with increasing age. This result suggests that cognitive ageing rate is faster in large-brained female guppies, potentially due to the faster ageing and shorter lifespan in the large-brained selection lines. It also means that cognition levels align across different brain sizes with older age. We conclude that there are cognitive consequences of ageing that vary with relative brain size in advanced learning abilities, whereas fundamental aspects of learning can be maintained throughout the ecologically relevant life span.

Ämnesord och genrebeteckningar

MEDICIN OCH HÄLSOVETENSKAP Annan medicin och hälsovetenskap Gerontologi, medicinsk/hälsovetenskaplig inriktning hsv//swe
MEDICAL AND HEALTH SCIENCES Other Medical and Health Sciences Gerontology, specialising in Medical and Health Sciences hsv//eng
Senescence
Behavioural flexibility
Reversal learning

Biuppslag (personer, institutioner, konferenser, titlar ...)

Amcoff, MirjamStockholms universitet,Zoologiska institutionen(Swepub:su)mamco (författare)
Buechel, Séverine D.Stockholms universitet,Zoologiska institutionen(Swepub:su)sbuec (författare)
Kotrschal, AlexanderStockholms universitet,Zoologiska institutionen,Wageningen University & Research, Netherlands(Swepub:su)akotr (författare)
Kolm, NiclasStockholms universitet,Zoologiska institutionen(Swepub:su)nkolm (författare)
Stockholms universitetZoologiska institutionen (creator_code:org_t)

Sammanhörande titlar

Ingår i:Experimental Gerontology: Elsevier BV1460531-55651873-6815

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Av författaren/redakt...: Boussard, Annika; Amcoff, Mirjam; Buechel, Séverin ...; Kotrschal, Alexa ...; Kolm, Niclas

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MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Annan medicin oc ...; och Gerontologi medi ...

Artiklar i publikationen: Experimental Ger ...

Av lärosätet: Stockholms universitet

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