Stevens attributed individual differences in power function exponents mainly to differences in "the regression effect" and suggested that balancing for regression may largely do away with individual differences. Cross-modality matches of loudness to apparent time duration, and vice versa, were repeated over six sessions for each of 20 5s with 24 hr. between sessions. Individual differences, indicated by analysis of variance, Kendall's W, and significant positive correlations across sessions, occurred before and after regression balances. Group exponents for duration matches increased over sessions, but those for loudness matches and those obtained by regression balance did not change significantly.
FINAL DISPOSITION Thu re port may be destroyed whe n it us no longer needed. PI.a do not return it to the U. S. Army Re.earch I nstitute fo, the Behev.or.l and Social Science..~~
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