Dual-memory processes in crack cocaine dependents: The effects of childhood neglect on recall

Abstract

Exposure to adversities during sensitive periods of neurodevelopment is associated with the subsequent development of substance dependence and exerts harmful, long-lasting effects upon memory functioning. In this study, we investigated the relationship between childhood neglect (CN) and memory using a dual-process model that quantifies recollective and non-recollective retrieval processes in crack cocaine dependents. Eighty-four female crack cocaine–dependent inpatients who did (N = 32) or did not (N = 52) report a history of CN received multiple opportunities to study and recall a short list composed of familiar and concrete words and then received a delayed-recall test. Crack cocaine dependents with a history of CN showed worse performance on free-recall tests than did dependents without a history of CN; this finding was associated with declines in recollective retrieval (direct access) rather than non-recollective retrieval. In addition, we found no evidence of group differences in forgetting rates between immediate- and delayed-recall tests. The results support developmental models of traumatology and suggest that neglect of crack cocaine dependents in early life disrupts the adult memory processes that support the retrieval of detailed representations of events from the past.

Keywords:

• Memory
• Cocaine
• Childhood neglect
• Dual processes
• Free recall

This work was supported by the CNPq, MCT/CT-Saúde, DECIT/SCTIE/MS, FAPERS-PqG and CAPES Foundation.

This work was supported by the CNPq, MCT/CT-Saúde, DECIT/SCTIE/MS, FAPERS-PqG and CAPES Foundation.

Notes

¹ Although the sample was composed of poly-substance users, crack cocaine was their self-reported drug of choice, and crack cocaine dependence was always the primary diagnosis.