Document Detail

Further experiments on the relationship between hippocampus and orientation following phase-shift in homing pigeons.
MedLine Citation:
PMID:  10701659     Owner:  NLM     Status:  MEDLINE    
Following a clock- or phase-shift of the light dark cycle, hippocampal lesioned pigeons (Columba livia) consistently display a larger deviation in vanishing bearings away from the homeward direction compared to intact birds; an effect never seen in unshifted birds. In Experiment 1, control and hippocampal lesioned pigeons oriented similarly after being held 1 week under artificial lighting in the absence of a phase-shift. Housing under artificial light by itself does not result in between group orientation differences. In Experiment 2, control and hippocampal lesioned pigeons oriented equally well under overcast conditions, indicating that both groups had a functional magnetic compass. The between group difference in orientation following phase-shift does not appear to be a consequence of control birds being able to use both the sun and earth's magnetic field for orientation and the hippocampal lesioned pigeons only being able to use the sun. In Experiment 3, lengthening the time held under 6-h clock-shift from 1 to 2 weeks had no effect on the magnitude of the difference in orientation, but fast shifting produced clearer effects than slow shifting. Taken together, the data suggest that hippocampal lesions alter how a pigeon responds to a rapidly changing light-dark cycle, particularly following a fast-shift manipulation, suggesting an as yet unspecified relationship between the avian hippocampus and the circadian rhythm(s) that regulate sun compass orientation.
P Ioalè; A Gagliardo; V P Bingman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Behavioural brain research     Volume:  108     ISSN:  0166-4328     ISO Abbreviation:  Behav. Brain Res.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-03-21     Completed Date:  2000-03-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8004872     Medline TA:  Behav Brain Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  157-67     Citation Subset:  IM    
Dipartimento di Etologia, Ecologia ed Evoluzione, Università di Pisa, Italy.
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MeSH Terms
Biological Clocks / physiology*
Circadian Rhythm / physiology*
Hippocampus / injuries,  physiology*
Orientation / physiology*
Time Perception

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

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