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Sven Schrader (HONDA Research Institute Europe GmbH, Offenbach, Germany)

"A columnar model of bottom-up and top-down processing in the neocortex" / Thursday, May 20, 2010, 17:15 h
When May 20, 2010
from 05:15 PM to 07:00 PM
Where Lecture Hall, Hansastr. 9a
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The Bernstein Center Freiburg

Bernstein Seminar
Sven Schrader
HONDA Research Institute Europe GmbH
Offenbach, Germany

A columnar model of bottom-up and top-down processing in the neocortex

Thursday, May 20, 2010

17:15 h

Lecture Hall (ground floor)
BCCN building
Hansastraße 9A
79104 Freiburg
In vision, an object representation is constructed through a cascade of areas, each processing more and more elaborate features of the stimulus image. We hypothesize that the necessary signal flow involves a feed-forward path to compose the object representation as well as a feedback path to refine the representation and to correct errors. Using word recognition as a metaphor for visual stimuli, we have implemented this architecture in a spiking neural network. Given a string of characters, the network quickly generates an initial stimulus hypothesis after only 20-30 ms. Already the first wave of action potentials traveling upwards the hierarchy contains the correct local symbols (syllables, word) of the presented stimulus primitives. In most cases, the activation of the correct word precedes all other candidates with millisecond precision and is most pronounced. Thus, our model codes the correctness of a response in its relative latency. In a subsequent refinement stage, where high-level activity modulates lower stages, this activation dominance is propagated back, influencing its own afferent activity to exhibit a unique decision.
The talk is open to the public. Guests are cordially invited!


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