Eigen-Adaptation and Distributed Representation of 2-D Phase, Energy, Scale and Orientation in Spatial Vision

Keith Langley, Stephen J. Anderson

Research output: Contribution to journalConference abstractpeer-review

Abstract

Distributed representations (DR) of cortical channels are pervasive in models of spatio-temporal vision. A central idea that underpins current innovations of DR stems from the extension of 1-D phase into 2-D images. Neurophysiological evidence, however, provides tenuous support for a quadrature representation in the visual cortex, since even phase visual units are associated with broader orientation tuning than odd phase visual units (J.Neurophys.,88,455–463, 2002). We demonstrate that the application of the steering theorems to a 2-D definition of phase afforded by the Riesz Transform (IEEE Trans. Sig. Proc., 49, 3136–3144), to include a Scale Transform, allows one to smoothly interpolate across 2-D phase and pass from circularly symmetric to orientation tuned visual units, and from more narrowly tuned odd symmetric units to even ones. Steering across 2-D phase and scale can be orthogonalized via a linearizing transformation. Using the tiltafter effect as an example, we argue that effects of visual adaptation can be better explained by via an orthogonal rather than channel specific representation of visual units. This is because of the ability to explicitly account for isotropic and cross-orientation adaptation effect from the orthogonal representation from which both direct and indirect tilt after-effects can be explained.
Original languageEnglish
Article number4P2M126
Pages (from-to)356
Number of pages1
JournalPerception
Volume44
Issue numberSuppl.1
DOIs
Publication statusPublished - 31 Aug 2015
Event38th European Conference on Visual Perception - Liverpool, United Kingdom
Duration: 24 Aug 201627 Aug 2016

Bibliographical note

ECVP 2015 Abstract: 38th European Conference on Visual Perception (ECVP) 2015 Liverpool

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