Signal but not noise changes with perceptual learning
Article Abstract:
New research supports connectionist network models and classical learning theories indicating that learning boosts the strength of discriminate signals. It is still unclear how signal enhancement shows itself at the neuronal level. This research involved making sets of faces and textures whose signal strength could be changed. Observers were trained to identify these patterns embedded in noise. Performance improved by up to 400% across a number of sessions. Learning boosted the efficiency with which observers encoded task-relevant information. It appears that the neural correlates of behaviour should show improved discrimination among stimuli and constant variability during perceptual learning.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Speed perception fogs up as visibility drops
Article Abstract:
Foggy weather causes many road accidents, mainly because drivers drive too fast. New research suggests that fog reduces the contrast of the driver's image, causing a decreased sense of speed. Trials show that foggier scenes give drivers the impression of slower movement, causing them to speed up as the fog increases.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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