Prospective memory impairment in long-term opiate users
Terrett, Gillian McLennan, Skye Henry, Julie Biernacki, Kathryn Mercuri, Kimberly Curran, Valerie Rendell, Peter
Terrett, Gillian
McLennan, Skye
Henry, Julie
Biernacki, Kathryn
Mercuri, Kimberly
Curran, Valerie
Rendell, Peter
Abstract
Rationale: Opiate use is associated with a range of neurological and cognitive deficits. However, to date, no studies have assessed whether these cognitive deficits extend to the ability to perform intended actions in the future (i.e. prospective memory). Reduced ability in this area might be anticipated due to impaired executive functions and episodic memory associated with long-term opiate use.
Objectives: The main objectives of this study are to assess the performance of long-term opiate users on a laboratory measure of prospective memory which closely simulates the types of prospective memory tasks encountered in everyday life (‘Virtual Week’) and to investigate the extent to which prospective memory performance is related to executive functions and episodic memory ability.
Methods: Twenty-six long-term heroin users enrolled in an opiate substitution program, and 30 controls with no previous history of drug use were tested on Virtual Week. Retrospective memory and executive functions were also assessed.
Results: Long-term opiate users were significantly impaired on prospective memory performance compared with controls (p = 0.002, η2 p = 0.17), and these deficits did not vary as a function of prospective memory task type (regular, irregular, event, time). The findings also suggest that retrospective memory difficulties contribute to the prospective memory difficulties seen in opiate users (r s = 0.78, p < 0.001) but that executive dysfunction is less influential.
Conclusions: Prospective memory is sensitive to long-term opiate use. Importantly, opiate users suffer from generalised deficits in prospective memory, regardless of the task demands, which may have significant implications for day-to-day functioning. These results may therefore contribute to the development of clinical intervention strategies to reduce the negative impact of prospective memory failures in daily life.
Keywords
Date
2014
Type
Journal article
Journal
Psychopharmacology
Book
Volume
231
Issue
13
Page Range
2623-2632
Article Number
ACU Department
School of Behavioural and Health Sciences
Faculty of Health Sciences
Faculty of Health Sciences