Response latency and brightness judgments by monkeys

Douglas L. Medin*, Mary L. Borkhius, Roger T. David

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Trained 7 stumptail and 4 rhesus monkeys on a successive black-white discrimination (e.g., black go left, white go right) and then gave them transfer tests to intermediate gray stimuli. Both response latencies and Ss' judgments were recorded. Consistent with other studies and a "no vicarious trial and error" (NO-VTE) model of choice behavior, Ss' judgments of the gray stimuli were graded rather than dichotomous. Contrary to the NO-VTE model, response latencies were curvilinearly related to the shade of gray. A simple "vicarious trial and error" model accounted for both main features of the data. The latter model also suggested that S's initial left-right orientation was an important factor in determining whether S's judgments of the gray stimuli were biased toward black or white. Response latencies of individual Ss support this implication. (PsycINFO Database Record (c) 2006 APA, all rights reserved).

Original languageEnglish (US)
Pages (from-to)480-485
Number of pages6
JournalJournal of Experimental Psychology
Issue number3 PART 1
StatePublished - Mar 1970


  • brightness discrimination & transfer, response latency, vicarious trial & error model, monkey

ASJC Scopus subject areas

  • Medicine(all)


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