We are pleased to announce the availability of the following paper, which
we hope will be of interest:
Visual binding through reentrant connectivity and dynamic synchronization
in a brain-based device
Seth, A.K., McKinstry, J.L., Edelman, G.M., and Krichmar, J.L. (2004).
Cerebral Cortex, 14:1185-99
The paper is available from www.nsi.edu/users/seth/. Please address any
questions or comments to seth@nsi.edu.
Abstract:
Effective visual object recognition requires mechanisms to bind object
features (e.g. color, shape and motion) while distinguishing distinct
objects. Synchronously active neuronal circuits among reentrantly connected
cortical areas may provide a basis for visual binding. To assess the
potential of this mechanism, we have constructed a mobile brain-based
device, Darwin VIII, which is guided by simulated analogues of cortical and
sub-cortical areas required for visual processing, decision-making, reward
and motor responses. These simulated areas are reentrantly connected and
each area contains neuronal units representing both the mean activity level
and the relative timing of the activity of groups of neurons. Darwin VIII
learns to discriminate among multiple objects with shared visual features
and associates 'target' objects with innately preferred auditory cues. We
observed the co-activation of globally distributed neuronal circuits that
corresponded to distinct objects in Darwin VIII's visual field. These
circuits, which are constrained by a reentrant neuroanatomy and modulated
by behavior and synaptic plasticity, are necessary for successful
discrimination. By situating Darwin VIII in a rich real-world environment
involving continual changes in the size and location of visual stimuli due
to self-generated movement, and by recording its behavioral and neuronal
responses in detail, we were able to show that reentrant connectivity and
dynamic synchronization provide an effective mechanism for binding the
features of visual objects.
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Anil K Seth, D.Phil.,
Associate Fellow, The Neurosciences Institute,
10640 John Jay Hopkins Drive, San Diego, CA 92121,
email: seth@nsi.edu, web: www.nsi.edu/users/seth/
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