Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-6391
Main Title: Linking appearance to neural activity through the study of the perception of lightness in naturalistic contexts
Author(s): Maertens, Marianne
Shapley, Robert
Type: Article
Language Code: en
Abstract: The present paper deals with the classical question how a psychological experience, in this case apparent lightness, is linked by intervening neural processing to physical variables. We address two methodological issues: (a) how does one know the appropriate physical variable (what is the right x ?) to look at, and (b) how can behavioral measurements be used to probe the internal transformation that leads to psychological experience. We measured so-called lightness transfer functions (LTFs), that is the functions that describe the mapping between retinal luminance and perceived lightness for naturalistic checkerboard stimuli. The LTFs were measured for different illumination situations: plain view, a cast shadow, and an intervening transparent medium. Observers adjusted the luminance of a comparison patch such that it had the same lightness as each of the test patches. When the data were plotted in luminance–luminance space, we found qualitative differences between mapping functions in different contexts. These differences were greatly diminished when the data were plotted in terms of contrast. On contrast–contrast coordinates, the data were compatible with a single linear generative model. This result is an indication that, for the naturalistic scenes used here, lightness perception depends mostly on local contrast. We further discuss that, in addition to the mean adjustments, one may fi nd it useful to consider also the variability of an observer’s adjustments in order to infer the true luminance-to-lightness mapping function.
URI: https://depositonce.tu-berlin.de//handle/11303/7082
http://dx.doi.org/10.14279/depositonce-6391
Issue Date: 2013
Date Available: 27-Oct-2017
DDC Class: 590 Tiere (Zoologie)
610 Medizin, Gesundheit
Subject(s): lightness
context
contrast
naturalistic scenes
Sponsor/Funder: DFG, MA5127/1-1, Die Bestimmung der Beziehung zwischen subjektiver Empfindung und Diskriminationsvermögen durch eine Kombination aus Psychophysik, Computationaler Modellierung und der Messung neuronaler Antworten
Usage rights: Terms of German Copyright Law
Journal Title: Visual neuroscience
Publisher: Cambridge University Press
Publisher Place: Cambridge
Volume: 30
Issue: 5-6
Publisher DOI: 10.1017/s0952523813000229
Page Start: 289
Page End: 298
EISSN: 1469-8714
ISSN: 0952-5238
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Fachgebiet Modellierung kognitiver Prozesse » Publications

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