CUED Publications database

Perceptual learning, roving and the unsupervised bias

Herzog, MH and Aberg, KC and Frémaux, N and Gerstner, W and Sprekeler, H (2012) Perceptual learning, roving and the unsupervised bias. Vision Research, 61. pp. 95-99. ISSN 0042-6989

Full text not available from this repository.

Abstract

Perceptual learning improves perception through training. Perceptual learning improves with most stimulus types but fails when . certain stimulus types are mixed during training (roving). This result is surprising because classical supervised and unsupervised neural network models can cope easily with roving conditions. What makes humans so inferior compared to these models? As experimental and conceptual work has shown, human perceptual learning is neither supervised nor unsupervised but reward-based learning. Reward-based learning suffers from the so-called unsupervised bias, i.e., to prevent synaptic " drift" , the . average reward has to be exactly estimated. However, this is impossible when two or more stimulus types with different rewards are presented during training (and the reward is estimated by a running average). For this reason, we propose no learning occurs in roving conditions. However, roving hinders perceptual learning only for combinations of similar stimulus types but not for dissimilar ones. In this latter case, we propose that a critic can estimate the reward for each stimulus type separately. One implication of our analysis is that the critic cannot be located in the visual system. © 2011 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Bisection stimuli Neural networks Perceptual learning Roving
Subjects: UNSPECIFIED
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 14 Dec 2014 03:45
DOI: 10.1016/j.visres.2011.11.001