First come, first served: Primacy effect in mate choiche.

ThesiS 

Tesi di Laurea 

Scienze della Vita 

Title: First come, first served: Primacy effect in mate choiche.Other Titles: First come, first served: Primacy effect in mate choice.Authors: Braga, AlessandroAdvisor: Leanza, GiampieroCo-Advisor: Lima, Susana Q.Issue Date: 27-Mar-2015Publisher: Università degli studi di TriesteAbstract: Mate choice is a basic decision process with huge implications for the individual and the species. The use of perceived clues to select a behavior depends on their association with behavioral outcomes, early life conditioning and genetic imprinting. A reliable model for the study of the interaction of such factors has been proved to be the Mus Musculus female, whose mate preference has a strong dependence on early postnatal experience. When raised in their environment, female develop a robust homosubspecific male preference; when raised in a Domesticus environment they display a consistent preference for the first male encountered, an effect called Primacy. To properly assess the consistency of this primacy effect we optimized the Y maze limited interaction social preference test previously employed. Genetically identical males were presented to the female to minimize choice-driving factors and habituation/dishabituation tests were performed to ensure the females were able to discriminate between them. Given the role of the noradrenergic system in social preference, arousal and attention we attempted to modulate the effect manipulating it with systemic injections of the beta-blocker Propranolol. Our results confirm the presence of a strong primacy effect when other choice driving factors are absent in the Musculus mate choice model, but we failed to modulate it pharmacologically as Propranolol diminished the interest toward both male equally, and the primacy effect was disrupted also in the control group, possibly due to treatment administration dependent stress. Taken together our results suggest that primacy effects seem to be present in most cognitive processes and easily masked by more prominent factors, and that to elucidate the different contributors to such mechanisms non-stressful techniques with good temporal and spatial resolution are to be preferred.Corso di laurea: NEUROSCIENZEDescription: 2013/2014Keywords: behavioralanalysis
matechoice
noradrenaline
serialposition
primacyeffectType: Tesi magistraleConsultability: PermessaAppears in Collections:Scienze della Vita

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