Abstract:
:The effects of test stimulus range on generalization gradients in humans were assessed for discriminations between faces that varied in brightness, faces that varied in orientation in the picture plane, and morphed faces. In Experiment 1, significant range effects, predicted by adaptation level theory, occurred when faces varied along the brightness or orientation dimension, but not for morphed faces. Changing the difficulty of discrimination of both training and test stimuli for Experiment 2 produced range effects in morphed faces. Experiment 3 explored training and testing stimulus factors as determinants of range effects in morphed faces. The results suggest that sufficiently biased testing ranges create shifts in response distributions (generalization gradients), and this may be amplified byusing relatively difficult discriminations between training stimuli.
journal_name
Learn Behavjournal_title
Learning & behaviorauthors
Verbeek EL,Spetch ML,Cheng K,Clifford CWdoi
10.3758/bf03192878subject
Has Abstractpub_date
2006-08-01 00:00:00pages
229-40issue
3eissn
1543-4494issn
1543-4508journal_volume
34pub_type
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