“…A number of studies suggest that the memory of a specific perceptual episode may already contain metric information (see also Tulving, 1972Tulving, , 1983. Undergraduates are extremely accurate in estimating from memory a variety of stimulus attributes in their familiar environment, including the distances between campus buildings (Baird, Merrill, & Tannenbaum, 1979;Sherman, Croxton, & Giovanatto, 1979), the quality of visual and auditory aesthetics at outdoor locations (Merrill & Baird, 1980), as well as the number and nature of social activities occurring indoors (Baird, Noma, Nagy, & Quinn, 1976). In addition, studies of mental psyehophysies in which subjects compare attributes of objects on different dimensions suggest that information specific to episodic exemplars can be used in mental comparisons (Hubbard, 1988;Kerst & Howard, 1978;Mover, Bradley, Sorenson, Whiting, & Mansfield, 1978).…”