Recent evidence in natural and semi-natural settings has revealed a variety of left-right perceptual asymmetries among vertebrates. These include preferential use of the left or right visual hemifield during activities such as searching for food, agonistic responses, or escape from predators in animals as different as fish, amphibians, reptiles, birds, and mammals. There are obvious disadvantages in showing such directional asymmetries because relevant stimuli may be located to the animal's left or right at random; there is no a priori association between the meaning of a stimulus (e.g., its being a predator or a food item) and its being located to the animal's left or right. Moreover, other organisms (e.g., predators) could exploit the predictability of behavior that arises from population-level lateral biases. It might be argued that lateralization of function enhances cognitive capacity and efficiency of the brain, thus counteracting the ecological disadvantages of lateral biases in behavior. However, such an increase in brain efficiency could be obtained by each individual being lateralized without any need to align the direction of the asymmetry in the majority of the individuals of the population. Here we argue that the alignment of the direction of behavioral asymmetries at the population level arises as an "evolutionarily stable strategy" under "social" pressures occurring when individually asymmetrical organisms must coordinate their behavior with the behavior of other asymmetrical organisms of the same or different species.

Survival with an asymmetrical brain: Advantages and disadvantages of cerebral lateralization / Vallortigara, Giorgio; Rogers, L. J.. - In: BEHAVIORAL AND BRAIN SCIENCES. - ISSN 0140-525X. - STAMPA. - vol. 28:no. 4(2005), pp. 575-589. [10.1017/S0140525X05000105]

Survival with an asymmetrical brain: Advantages and disadvantages of cerebral lateralization

Vallortigara, Giorgio;
2005-01-01

Abstract

Recent evidence in natural and semi-natural settings has revealed a variety of left-right perceptual asymmetries among vertebrates. These include preferential use of the left or right visual hemifield during activities such as searching for food, agonistic responses, or escape from predators in animals as different as fish, amphibians, reptiles, birds, and mammals. There are obvious disadvantages in showing such directional asymmetries because relevant stimuli may be located to the animal's left or right at random; there is no a priori association between the meaning of a stimulus (e.g., its being a predator or a food item) and its being located to the animal's left or right. Moreover, other organisms (e.g., predators) could exploit the predictability of behavior that arises from population-level lateral biases. It might be argued that lateralization of function enhances cognitive capacity and efficiency of the brain, thus counteracting the ecological disadvantages of lateral biases in behavior. However, such an increase in brain efficiency could be obtained by each individual being lateralized without any need to align the direction of the asymmetry in the majority of the individuals of the population. Here we argue that the alignment of the direction of behavioral asymmetries at the population level arises as an "evolutionarily stable strategy" under "social" pressures occurring when individually asymmetrical organisms must coordinate their behavior with the behavior of other asymmetrical organisms of the same or different species.
2005
no. 4
Vallortigara, Giorgio; Rogers, L. J.
Survival with an asymmetrical brain: Advantages and disadvantages of cerebral lateralization / Vallortigara, Giorgio; Rogers, L. J.. - In: BEHAVIORAL AND BRAIN SCIENCES. - ISSN 0140-525X. - STAMPA. - vol. 28:no. 4(2005), pp. 575-589. [10.1017/S0140525X05000105]
File in questo prodotto:
File Dimensione Formato  
survival_asymmetrical_brainBBS2005.pdf

Solo gestori archivio

Tipologia: Post-print referato (Refereed author’s manuscript)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 772.86 kB
Formato Adobe PDF
772.86 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/8950
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 903
  • ???jsp.display-item.citation.isi??? 859
social impact