Document Detail

Looming responses of telencephalic neurons in the pigeon are modulated by optic flow.
MedLine Citation:
PMID:  19822131     Owner:  NLM     Status:  MEDLINE    
The movement of animals through space filled with various objects requires the interaction between neuronal mechanisms specialized for processing local object motion and those specialized for processing optic flow generated by self-motion of the animal. In the avian brain, visual nuclei in the tectofugal pathway are primarily involved in the detection of object motion. By contrast, the nucleus of the basal optic root (nBOR) and the pretectal nucleus lentiformis mesencephali (nLM) are dedicated to the analysis of optic flow. But little is known about how these two systems interact. Using single-unit recording in the entopallium of the tectofugal pathway, we show that some neurons appeared to be integrating visual information of looming objects and whole-field motion simulating optic flow. They specifically responded to looming objects, but their looming responses were modulated by optic flow. Optic flow in the nasotemporal direction, typically produced by the forward movement of the bird, only mildly inhibited the looming responses. Furthermore, these neurons started firing later than when the looming object was presented against a stationary background. However, optic flow in other directions, especially the temporonasal direction, strongly inhibited their looming responses. Previous studies have implicated looming-sensitive neurons in predator avoidance behavior and these results suggest that a bird in motion may need less time to initiate an avoidance response to an approaching object.
Qian Xiao; Barrie J Frost
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-10-12
Journal Detail:
Title:  Brain research     Volume:  1305     ISSN:  1872-6240     ISO Abbreviation:  Brain Res.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-25     Completed Date:  2010-01-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  40-6     Citation Subset:  IM    
Department of Psychology, Queen's University, 62 Arch Street, Kingston, Ontario, Canada K7L 3N6.
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MeSH Terms
Action Potentials / physiology*
Analysis of Variance
Columbidae / physiology*
Motion Perception / physiology*
Movement / physiology
Neural Inhibition / physiology
Neurons / physiology*
Orientation / physiology
Photic Stimulation
Space Perception / physiology
Telencephalon / physiology*
Vision, Binocular / physiology
Visual Fields / physiology
Visual Pathways / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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