Geometric ratio perception and preference among objects in rats

Pessoa, J. A.; Winnie, J.; Ribeiro, Sidarta Tollendal Gomes; Vasconcelos, N.; Nascimento, G.; Lobão-Soares, B.

Geometric ratio perception and preference among objects in rats

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dc.contributor.author	Pessoa, J. A.
dc.contributor.author	Winnie, J.
dc.contributor.author	Ribeiro, Sidarta Tollendal Gomes
dc.contributor.author	Vasconcelos, N.
dc.contributor.author	Nascimento, G.
dc.contributor.author	Lobão-Soares, B.
dc.date.accessioned	2017-11-27T16:26:21Z
dc.date.available	2017-11-27T16:26:21Z
dc.date.issued	2011-08
dc.description.resumo	Objectives: The novel object preference test (NOPT) has been, in the last years, standardized for tasks in rodents as a behavioral parameter for evaluation of memory consolidation and also for evaluation of exploration preference among different objects presented at the same time. The geometric patterns of this preference are poorly understood and vary considering different species. In humans, it is known that body proportions close to gold ratio (1.618) are considered “aesthetic”. Considering fMRI studies, it is possible to observe differential signal activation of limbic areas in the human insula when individuals have visual contact with body segments with golden ratio. Nevertheless, as far as we know, no other geometric object preference study was performed in other species. The aim of this work was to evaluate in rats a possible exploration preference considering tripartite objects made with discrete variations of its proportions, and if they could disclose preference for same material made, but unfamiliar (new) objects when presented 24 hours after the first exposition. Methods and Results: On the first day, five male Wistar adult rats were placed in an open field arena with three steel objects composed by three stacked balls whose diameter follows three different ratios (1.2; 1.618/gold ratio; 1.8), placed at equidistant points. Twenty four hours after, these animals were exposed to the same objects of the first task, together with three new steel cylindrical objects (same proportions, height and size of the ball objects). Images were processed with any-maze behavior analysis software and time of object exploration was counted within each animal. ANOVA with Tukey´s post hoc test was performed for preference and memory tests, and p set at 0.05. On the first day, we found a huge object preference (p= 0.01) related to the 1.8 proportion balls (140.5 SD 36.09), when compared to both 1.618 (21.44 SD 8.91) and 1.2 ball (30.9 SD 19.58) composed objects. Surprisingly, on the second day the exploration time was similar in both familiar and unfamiliar objects, revealing no novel object preference in this case. Also, in the second exposition, they did not disclose any preference by a specific proportion, as they did in the first day for 1.8 balls, considering both ball and cylindrical objects (all p values > 0.05). Conclusions: We might expect a possible existence of an innate and species-specific pattern of aesthetic preference in rodents considering geometric evaluation of different proportions. Also, that only variation of proportions (not material variation of objects) may be not sufficient for studying memory consolidation in the NOPT. Finally, that when exposed to many objects, these animals may lose the preference for some exploration pattern related to a specific geometric proportion.	pt_BR
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/24380
dc.language	eng	pt_BR
dc.rights	Acesso Aberto	pt_BR
dc.subject	Fibonacci	pt_BR
dc.subject	Golden ratio	pt_BR
dc.subject	Memory	pt_BR
dc.subject	Mice	pt_BR
dc.subject	Novel Object Preference Test	pt_BR
dc.title	Geometric ratio perception and preference among objects in rats	pt_BR
dc.type	conferenceObject	pt_BR