Additivity, subadditivity, and the use of visual information: a reply to Massaro (1988).
Previously we (Bruno & Cutting, 1988) explored the perception of spatial relations among objects laid out in a computer-generated environment. In his commentary on our article, Massaro (1988) raised several issues. The most important is from his reanalysis, which indicated that--because of a subadditive trend in the results--additive and multiplicative strategies fit our data in Experiment 1 about equally well. In reply, we performed a different analysis. Results corroborate subadditivity--and hence multiplicative information combination--in Experiment 1 but provide no evidence for it in Experiments 2 and 3. On the whole, then, the results still support additivity more strongly than any other combination rule and thus support our notion of minimodularity.
Cutting
J E
JE
Department of Psychology, Cornell University, Ithaca, New York 14857-7601.
Bruno
N
N
D003867:Depth Perception; D006801:Humans; D008960:Models, Psychological