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Metamemory without the memory: are people aware of midazolam-induced amnesia?
Paul Merritt1, Elliot Hirshman, John Hsu
1Department of Psychology, George Washington University, 2125 G Street NW, Washington, DC 20052, USA. paul.merritt@mail.tamucc.edu
Rationale:
Midazolam is a benzodiazepine which produces a dense anterograde amnesia, while permitting relatively well-preserved short-term memory, semantic retrieval, and other higher cognitive functions. Given these preserved abilities, we were interested in whether or not participants given midazolam would be aware of this anterograde amnesia.
Method:
In the present experiment, participants were given midazolam in one testing session and a saline placebo in another. Participants provided judgments-of-learning (JOLs) immediately following study of cue-target pairs. During the test phase of the experiment, confidence levels and feeling-of-knowing (FOK) judgments were collected.
Results:
Although cued recall performance was substantially impaired in the midazolam condition, mean JOLs were unaffected, indicating participants had little insight into their impairment during the study phase. Participants were relatively accurate in confidence levels and FOK judgments in the midazolam condition.
Conclusion:
When studying items under the influence of midazolam, participants are unaware that their memory will be impaired. Implications for clinical practice and pharmacological studies of amnesia are discussed.
Insights
Participants taking midazolam (a benzodiazepine) did not realize their memory was impaired during learning, despite significant anterograde amnesia. This lack of awareness has implications for memory research and clinical settings.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Pharmacology
Background:
- Midazolam, a benzodiazepine, induces anterograde amnesia while preserving some cognitive functions.
- Understanding the subjective awareness of drug-induced memory impairment is crucial.
Purpose of the Study:
- To investigate whether participants are aware of the anterograde amnesia caused by midazolam.
- To assess insight into memory impairment under midazolam.
Main Methods:
- A within-subjects design comparing midazolam and placebo conditions.
- Participants made judgments-of-learning (JOLs) after studying information.
- Confidence and feeling-of-knowing (FOK) judgments were collected during testing.
Main Results:
- Midazolam significantly impaired cued recall performance.
- Judgments-of-learning (JOLs) were unaffected, showing no insight into memory deficits.
- Confidence and FOK judgments remained accurate despite amnesia.
Conclusions:
- Individuals under midazolam are unaware of their memory impairment during the learning phase.
- Findings highlight the dissociation between objective memory performance and subjective awareness.
- Implications for clinical use of midazolam and amnesia research are discussed.
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