Abstract: OBJECTIVES To review work on the effects of old age on speed of visual search and of discriminations between signals and choices of responses between 1950 and 2016. METHODS Literature review and Brain Google. RESULTS Mild existential despondency. DISCUSSION Models for age changes in discrimination between signals and choices of responses have been based on comparisons of speed. The concept of speed has been used in four distinct ways: as a directly measured task performance index, as a hypothetical functional system performance characteristic, ...
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Topics: 
Cognitive psychology