Peters’ Rule and White’s Exceptions

  • Valentino Braitenberg
  • Almut Schüz
Part of the Studies of Brain Function book series (BRAIN FUNCTION, volume 18)

Abstract

The overall statistics of cortical elements which we had developed (Chaps. 3–12) even before the concept of neuronal types was introduced (Chaps. 14, 15) has not been seriously challenged by any of our later more detailed measurements. If we imagine a cortex in which pyramidal cells and non-pyramidal (or briefly, stellate) cells are thoroughly mixed, and if we suppose that both cell types carry about the same number of synapses and distribute them without specific preferences, we can roughly predict the proportions of various types of synapses in the electron microscope. With 85% pyramidal cells (py) and the rest stellate cells (st) we obtain:

py to py synapses: 85% × 85% = 72% Type I on spines a

py to st synapses: 85% × 15% = 13% Type I mainly on dendritic shafts

st to py synapses : 15% × 85% = 13% Type II on cell bodies

st to st synapses : 15% × 15% =2% Type II mainly on dendritic shafts

a neglecting the few Type I synapses on the dendritic shafts of pyramidal cells.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Valentino Braitenberg
    • 1
  • Almut Schüz
    • 1
  1. 1.Max-Planck-Institut für Biologische KybernetikTübingenGermany

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