Tresilian, J.R., Mon-Williams, M. and Kelly, B.M. (1999) Increasing confidence in vergence as a cue to distance. Proceedings of the Royal Society B: Biological Sciences, 266 (1414). pp. 39-44. ISSN 0962-8452
Multiple cues contribute to the visual perception of an object's distance from the observer. The manner in which the nervous system combines these various cues is of considerable interest. Although it is accepted that image cues play a significant role in distance perception, controversy exists regarding the use of kinaesthetic information about the eyes' state of convergence. We used a perturbation technique to explore the contribution of vergence to visually based distance estimates as a function of both fixation distance and the availability of retinal information. Our results show that the nervous system increases the weighting given to vergence as (i) fixation distance becomes closer; and (ii) the available retinal image cues decrease. We also identified the presence of a strong contraction bias when distance cues were studied in isolation, but we argue that such biases do not suggest that vergence provides an ineffectual signal for nearâ€“space perception.
|Keywords:||distance estimates; fixation distance; kinaesthetic information; perception; visual cues|
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Psychology (Leeds) > Cognitive Psychology (Leeds)|
|Depositing User:||Repository Officer|
|Date Deposited:||25 Jun 2009 13:44|
|Last Modified:||18 Jun 2015 17:29|