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Related Experiment Videos

Directional control of hippocampal place fields

K J Jeffery1, J G Donnett, N Burgess

  • 1Department of Anatomy and Developmental Biology, University College London, UK. K.Jeffery@ucl.ac.uk

Experimental Brain Research
|January 10, 1998
PubMed
Summary

The rat hippocampus uses internal directional cues to orient place cells, which represent an environment. Manipulating the rat's sense of direction directly changed place field orientation, demonstrating its crucial role.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Spatial Navigation

Background:

  • The hippocampus contains place cells that fire in specific locations, forming a cognitive map.
  • Place cell receptive fields are influenced by environmental geometry, particularly walls.
  • A hypothesis suggests a polarizing directional input guides place field orientation.

Purpose of the Study:

  • To investigate if the rat's internal sense of direction can independently control place field orientation.
  • To determine the role of internal directional cues versus external environmental cues.

Main Methods:

  • Recorded place cell activity in rats foraging in a rectangular box.
  • Manipulated the rat's internal directional sense by rotating the rat independently of the environment.

Related Experiment Videos

  • Compared place field orientation with and without external room cues.

    • Main Results:

    • Rotating the rat alone almost always caused corresponding place field rotation when external cues were absent.
    • Rotating the recording box alone rarely altered field orientation.
    • External visual cues predominated over internal cues when present.

    Conclusions:

    • The rat's internal sense of direction is a key factor in orienting hippocampal place fields.
    • This finding allows for further research into the sensory basis of direction sense.
    • External cues can override internal directional information in determining place field orientation.