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. 2014 Mar 25;5:206. doi: 10.3389/fpsyg.2014.00206

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Copyright © 2014 Manns and Ströckens.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Visual processing in the tectofugal pathway of pigeons (left side) and the thalamofugal pathway of juvenile chickens (right side) is asymmetrically organized. In pigeons the projection from the right tectum opticum (TO) to the left nucleus rotundus (RT) are stronger than projection from the right TO to the left RT. In chickens the contralateral projections from left nucleus geniculatus lateralis pars dorsalis (Gld) to the right visual Wulst are stronger than projections from the right Gld to the left visual Wulst. These projection asymmetries lead to higher bilateral input to the left hemisphere in pigeons and to the right hemisphere in pigeons (indicated by darker coloring). These anatomical asymmetries lead to a lateralized behavior in each species (E, entopallium).