“…Slow forgetting, once considered unique to odor memory (Engen, 1977;Engen & Ross, 1973;Lawless & Cain, 1975), has also been demonstrated for voices (e.g., Legge, Grosmann, & Pieper, 1984) and simple visual forms (Cermak, 1971;Lawless, 1978). The present study expands our understanding of the forgetting of odors by showing that interference occurs when the target and distractor items are similar.…”