English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Positional variation in perceptual learning: quadratic ideal observation, recurrent pre-processing, and transfer

Zhaoping, L., Dayan, P., & Herzog, M. (2002). Positional variation in perceptual learning: quadratic ideal observation, recurrent pre-processing, and transfer. Poster presented at 25th European Conference on Visual Perception (ECVP 2002), Glasgow, UK.

Item is

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Zhaoping, L1, Author              
Dayan, P1, Author              
Herzog, MH, Author
Affiliations:
1External Organizations, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: Residual eye movements introduce positional variation of stimuli on the retina in different trials of psychophysical experiments, a fact usually overlooked in models of perceptual learning. Using a bisection task as an example, we show that small positional variation changes the structure of the decision rule from linear to quadratic dependence on neural activities that code the input stimuli, invalidating linear feedforward models. We propose that a recurrent intra-cortical net- work, presumably in V1, that pre-processes the stimuli and is tuned through perceptual learning, is responsible for improved performance. Computer simulations in a network designed for a specific distance (2-D) between the outer bars in the bisection stimuli confirm this. However, such networks improve and impair performances for D0 6ˆ D, implying positive and negative transfers of learning. Psychophysical tests, with bisection stimuli on an analog monitor controlled by a Macintosh, however, found only positive transfers, ie performance improvements, for D0 ˆ D D=2, based on training at D. No transfer was found from line to dot bisection stimuli, so learning was indeed perceptual, and transfer cannot be attributed to a general improvement.

Details

show
hide
Language(s):
 Dates: 2002-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1177/03010066020310S101
 Degree: -

Event

show
hide
Title: 25th European Conference on Visual Perception (ECVP 2002)
Place of Event: Glasgow, UK
Start-/End Date: 2002-08-25 - 2002-08-29

Legal Case

show

Project information

show

Source 1

show
hide
Title: Perception
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 31 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 94 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369