Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/20530
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Multiplication in curvature processing
Authors: Gheorghiu, Elena
Kingdom, Frederick A A
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: curvature
multiplication
adaptation
contour
after-effect
Issue Date: Feb-2009
Publisher: Association for Research in Vision and Ophthalmology
Citation: Gheorghiu E & Kingdom FAA (2009) Multiplication in curvature processing, Journal of Vision, 9 (2), Art. No.: 23.
Abstract: Multiplication rather than addition of neural signals is believed to underpin a variety of sensory processes, yet the evidence for multiplication is rare. Here we provide psychophysical evidence for neural multiplication in human visual processing of shape. We show that the curvature of a contour is likely detected by a mechanism that multiplies rather than adds the signals from afferent sub-units that detect parts of the curve. Using a novel perceptual after-effect, in which the perceived shape of a sinusoidal-shaped contour is altered following adaptation to a contour of slightly different sinusoidal shape, a pronounced ‘dip' in the size of the after-effect is found when the adapting contour is broken into segments of a particular length and spacing. Simulations reveal that the presence and shape of the dip is only expected if the afferent sub-units to curvature detectors are multiplied. The after-effect itself is then best explained in terms of the population response of a range of such curvature detectors tuned to different curvatures.
Type: Journal Article
URI: http://hdl.handle.net/1893/20530
DOI Link: http://dx.doi.org/10.1167/9.2.23
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Psychology
McGill University

Files in This Item:
File Description SizeFormat 
Gheorghiu and Kingdom (2009).pdf1.49 MBAdobe PDFUnder Embargo until 31/12/2999     Request a copy

Note: If any of the files in this item are currently embargoed, you can request a copy directly from the author by clicking the padlock icon above. However, this facility is dependant on the depositor still being contactable at their original email address.

This item is protected by original copyright



Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

If you believe that any material held in STORRE infringes copyright, please contact library@stir.ac.uk providing details and we will remove the Work from public display in STORRE and investigate your claim.