When selective adaptation and contrast effects are distinct: A reply to Diehl, Kluender, and Parker.

Two alternative conceptualizations of selective adaptation with speech have recently received attention: the adaptation level theory (AL) outlined by R. L. Diehl (see record 1981-05067-001) and a 2-stage model outlined by the 1st author and P. Jusczyk (see record 1982-00351-001). Diehl et al (see record 1986-05428-001) reported evidence of streaming in selective adaptation and claimed that their results provide a counterdemonstration to recent studies that have argued against the AL approach. It is shown how the Diehl et al results can be accounted for by both the 2-stage model and AL theory. Results are presented from a study with 74 undergraduates that compared adaptation and paired-comparison procedures. These results are precisely as predicted by the 2-stage model, but they cannot be accounted for by AL theory. (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)