Involuntary autobiographical memories recorded in a diary study are co
mpared to voluntary autobiographical memories retrieved in response to
verbal cues in a laboratory. The verbal cues were generated to be com
parable to the cues that were found to elicit the involuntary memories
. The findings demonstrate that voluntary and involuntary retrieval ma
y access different samples of autobiographical memories. The voluntary
memories were (1) less specific, (2) more frequently rehearsed, and (
3) less emotionally positive than the involuntary memories. A reanalys
is of the diary study examined conditions of involuntary retrieval. Th
e memories occurred most frequently when attention was diffuse. They w
ere typically triggered by environmental cues matching central feature
s of the remembered event. The findings are discussed in relation to c
urrent models of autobiographical memory.