Asymmetrical number-space mapping in the avian brain.

Abstract:

:When trained to peck a selected position in a sagittally-oriented series of identical food containers, and then required to generalize to an identical series rotated by 90°, chicks identify as correct only the target position from the left end, while choosing the right one at chance. Here we show that when accustomed to systematic changes in inter-elements distances during training or faced with similar spatial changes at test, chicks identify as correct both the target positions from left and right ends. However, ordinal position is spontaneously encoded even when inter-element distances are kept fixed during training (in spite of the fact that distances between elements suffice for target identification without any numerical computation). We explain these findings in terms of intra-hemispheric coupling of bilateral numerical (ordinal) representation and unilateral (right hemispheric) spatial representation of the number line, producing differential allocation of attention in the left and right visual hemifields.

journal_name

Neurobiol Learn Mem

authors

Rugani R,Vallortigara G,Vallini B,Regolin L

doi

10.1016/j.nlm.2010.11.012

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

231-8

issue

3

eissn

1074-7427

issn

1095-9564

pii

S1074-7427(10)00198-X

journal_volume

95

pub_type

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