How vernier acuity depends on contrast

Wehrhahn, C

doi:10.1007/BF00228001

Item

ITEM ACTIONSEXPORT

Add to Basket

Please note that a newer version of this item is available:
https://pure.mpg.de/pubman/item/item_1794737_2

DetailsSummary

Released

Journal Article

How vernier acuity depends on contrast

MPS-Authors

/persons/resource/persons84306

Wehrhahn, C
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Wehrhahn, C. (1990). How vernier acuity depends on contrast. Experimental Brain Research, 80(3), 616-618. doi:10.1007/BF00228001.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-EE99-1

Abstract

Vernier acuity was measured by finding the just discriminable offset for an edge separating fields of different luminances. The contrast of this stimulus is easily specified by the formula c = (L stim — L sur )(L stim + L sur ). Vernier thresholds are about 4–5 sec of arc for contrasts 0.22 and higher, but increase exponentially with decreasing contrast (Fig. 1). By comparison, the presence of the stimulus could be detected at a contrast of 0.016. The possible role of the magnocellular and parvocellular pathways in carrying the input signals to the fine localization process is discussed.