Effects of stimulus similarity in discrimination training upon wavelength generalization in pigeons

Arthur Tomie, Gregory A. Davitt, David R. Thomas

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Administered variable-interval training to 30 naive adult pigeons to peck a 550-nm light and then tested them for wavelength generalization. Ss were later assigned to 1 of 3 groups, matched for both relative generalization slope and response rate. One group then received successive discrimination training between the 555-nm stimulus (S+) and a vertical white line on a 555-nm background (S-); another group experienced the same S+ but a vertical white line on a black background as S-. A 3rd group received a comparable amount of single stimulus training with the 555-nm value. On a 2nd wavelength generalization test, the 1st group yielded greater sharpening of generalization than the 2nd group, whereas the 3rd group showed no change from Test 1. Results indicate that the sharpening of generalization gradients by discrimination training was directly related to the similarity of the discrimination training stimuli. (20 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved).

Original languageEnglish (US)
Pages (from-to)945-954
Number of pages10
JournalJournal of comparative and physiological psychology
Issue number2
StatePublished - Feb 1975
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine(all)


  • stimulus similarity in discrimination training, wavelength generalization, pigeons

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