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Early temperamental traits in an octopus (Octopus bimaculoides)


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Sinn, DL, Perrin, NA and Mather, JA 2001 , 'Early temperamental traits in an octopus (Octopus bimaculoides)' , Journal of Comparative Psychology, vol. 115, no. 4 , pp. 351-364 , doi: 10.1037//0735-7036.115.4351.

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During their 3rd week of life, 73 Octopus bimaculoides were observed to test whether discrete behaviors
could be grouped reliably to reflect dimensions of temperament. Frequencies of behaviors during Week 3
were subjected to principal-components analysis (PCA), resulting in 4 components (active engagement,
arousal/readiness, aggression, and avoidance/disinterest) that explain 53% of the variance. Levels of
temperamental traits were then evaluated for 37 octopuses using composite scores at 3 time points across
the first 9 weeks of life. Profile analysis revealed significant change for the testing group as a whole in
trait expression levels from Week 3 to Week 6. Results also suggest a significant effect of relatedness on
developing temperamental profiles of octopuses. Discussion focuses on how results apply to the life
history of O. bimaculoides and what temperament can reveal about adaptive individuality in a protostome.

Item Type: Article
Authors/Creators:Sinn, DL and Perrin, NA and Mather, JA
Journal or Publication Title: Journal of Comparative Psychology
ISSN: 0735-7036
DOI / ID Number: 10.1037//0735-7036.115.4351
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