Converging evidence from 3 studies suggests that how well information
transfers from one environment to another depends on how similar the e
nvironments feel rather than on how similar they look. Thus, even when
target events are encoded and retrieved in the same physical setting,
memory performance suffers if the attending affective states differ.
Conversely, a change in environment produces no performance decrement
if, whether by chance (Experiments 1 and 2) or by design (Experiment 3
), the mood at encoding matches the mood at retrieval. These observati
ons imply that place dependent effects are mediated by alterations in
affect or mood, and that data that appear on the surface to demonstrat
e place dependent memory may, at a deeper level, denote the presence o
f mood dependent memory. Discussion focuses on prospects for future re
search aimed at clarifying the relations among moods, places, and memo
ry.