Combining Probabilistic Population Codes

نویسندگان

  • Richard S. Zemel
  • Peter Dayan
چکیده

We study the problem of statistically correct inference in networks whose basic representations are population codes. Population codes are ubiquitous in the brain, and involve the simultaneous act ivi ty of many units coding for some low dimensional quantity. A classic example are place cells in the rat hippocampus: these fire when the animal is at a particular place in an environment, so the underlying quantity has two dimensions of spatial location. We show how to interpret the activi ty as encoding whole probabil i ty distributions over the underlying variable rather then just single values, and propose a method of inductively learning mappings between population codes that are computationally tractable and yet offer good approximations to statistically opt imal inference. We simulate the method on some simple examples to prove its competence.

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تاریخ انتشار 1997