Perception & Psychophysics

, Volume 24, Issue 3, pp 258–262 | Cite as

Improvement in vernier acuity with practice

  • Suzanne P. Mckee
  • Gerald Westhe


The ability to detect small differences in the positions of two lines (vernier acuity) showed some improvement with practice in all eight subjects, even for subjects given no error feedback. The average decline in threshold with training (2,000–2,500 responses) was about 40%. We used three target orientations: vertical, horizontal, and right oblique. Orientational differences remained stable in only one subject. In five subjects, orientational differences present at the beginning of training diminished or disappeared with increased experience; in two, they increased.


Astigmatism Amblyopia Practice Block Target Orientation Error Feedback 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Psychonomic Society, Inc. 1978

Authors and Affiliations

  • Suzanne P. Mckee
    • 1
  • Gerald Westhe
    • 1
  1. 1.Department of Physiology-AnatomyUniversity of CaliforniaBerkeley

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