Chapter

Transformation of Sensory Information Into Perceptual Information

Stephen Handel

in Perceptual Coherence

Published in print May 2006 | ISBN: 9780195169645
Published online September 2007 | e-ISBN: 9780199786732 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195169645.003.0002
 Transformation of Sensory Information Into Perceptual Information

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The auditory and visual receptive fields, identified by reverse correlation methods, transform the sensory information into perceptual information. Each receptive field acts like a linear bandpass filter that can be modeled as the Difference of Gaussian distributions. Due to inherent limitations in the resolution of sensory properties, each receptive field encodes a limited range of visual frequencies at a specific spatial position or orientation, or a limited range of auditory frequencies at a specific intensity or time point. For frequencies up to about 4,000Hz, auditory receptive fields can phase lock and fire at specific points in the wave. The hierarchical organization of the auditory and visual systems is characterized by feedforward where the outputs at one level are transformed at the next higher level. The transformations create general properties of objects, e.g., edges, boundaries, position, contrasts, motions. On the whole, one pathway conveys “what” information and the second conveys “where” information.

Keywords: difference of Gaussians; feedforward; linear bandpass filters; phase locking; reverse correlation; receptive fields; sensory resolution; what/where pathways

Chapter.  22895 words.  Illustrated.

Subjects: Cognitive Psychology

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