Perceptual Topography: Spatio-Temporal Analysis of Prepyriform, Visual, Auditory, and Somesthetic EEGs in Perception by Trained Rabbits

  • John M. Barrie
  • Walter J. Freeman
Conference paper


We tested the hypothesis that perceptually-related spatio-temporal patterns of neural activity are manifested in the EEG of neocortex. Arrays of 64 electrodes were fixed onto the epidural surfaces of the prepyriform, visual, auditory, and somesthetic cortices of 18 rabbits. After recovery, the subjects were trained to respond to simple conditioned stimuli in a classical aversive paradigm. The 64 EEG traces were recorded in 6 second trials, stored on disk, segmented, and decomposed by FFT or RMS analysis. Spatial pattern differences were determined by a Euclidean distance in 64-space and assigned a probability value. Differences between CS+ and CS- segments were found in narrow time windows post-stimulus. Perceptual activity was broad-band in nature. We conclude that the neural processes for perception are similar for sensory paleo-and neocortex, and that in all of these systems, perceptions are constructed by chaotic dynamics.


Respiratory Rhythm Full Field Flash Decrease Movement Artifact Prepyriform Cortex Train Rabbit 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • John M. Barrie
    • 1
  • Walter J. Freeman
    • 1
  1. 1.Division of Neurobiology, 129 Life Sciences Addition Department of Molecular and Cell BiologyUniversity of California at BerkeleyBerkeleyUSA

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