Effects of d-amphetamine in human models of information processing and inhibitory control
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Although stimulants are generally associated with enhanced information processing, reports of stimulant effects on behavioral functions that rely on inhibitory processes have been inconsistent. The present research tested the joint effects of d-amphetamine on information processing and inhibitory control in healthy adults (N = 22) with no reported history of illicit stimulant use or drug dependence. Information processing was measured by a rapid information processing (RIP) task and inhibitory control was measured using a stop-signal task. Performance was measured in response to 15 mg/70 kg, 7.5 mg/70 kg, and 0 mg/70 mg (placebo) doses of d-amphetamine, administered double-blind in a randomized, within-subjects design. Results showed that d-amphetamine improved information processing in a dose-dependent manner. By contrast, no enhancement of response inhibition was observed. Stimulant effects were also observed in physiological and subjective effects measures. The findings indicate that a stimulant drug can enhance aspects of cognitive functioning without producing a concomitant improvement in inhibitory control of behavior. The findings highlight the complex nature of stimulant effects on human behavior and the utility of performance tasks as models of complex behavioral and cognitive functions.
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Some studies reported a lack of AMP effects on inhibitory control, verbal memory, learning, or intelligence.
“However, other studies reported a lack of AMP effects on inhibitory control, as well as verbal memory, learning, inhibitory control or intelligence (Cavanagh et al., 2022; Comer et al., 1996; Fillmore et al., 2005; Ilieva et al., 2013; Makris et al., 2007; Mintzer & Griffiths, 2003; Patat et al., 1996)”
From Systematic reviews of the acute effects of amphetamine on working memory and other cognitive performances in healthy individuals, with a focus on the potential influence of personality traits (2023) · cites this paper as Fillmore et al., 2005
The Abstract and Discussion (section 4) report no improvement in inhibitory control after d-amphetamine in the healthy adults studied. This paper does not report a lack of effects on verbal memory, learning, or intelligence, which are also included in the citing sentence. (LLM, conf=0.88)
Experimental — accuracy not yet measuredFillmore et al. (2005) reported that dexamphetamine (15 and 7.5 mg) improved information processing (WM) without enhancing inhibitory response.
“For example, Fillmore et al. (2005) reported that dexamphetamine (15 and 7.5 mg) improved information processing (WM) without enhancing inhibitory response.”
From Systematic reviews of the acute effects of amphetamine on working memory and other cognitive performances in healthy individuals, with a focus on the potential influence of personality traits (2023) · cites this paper as Fillmore et al., 2005
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“…intelligence 20 mg 46 24 � 2.9 No Inhibitory control Dolder et al., 2018 SST (RT and accuracy) 40 mg 24 25.3 � 3 Improved for accuracy Inhibitory control Fillmore et al. (2005) SST (RT) 7.5 and 15 mg 18 21.5 � 3.2 No Inhibitory control de Bruijn et al. (2004) EFT (RT) 15 mg 12 22.6 � 5.7…”
BackgroundMethodInfluential
- Authors
- Fillmore, M. T., Kelly, T. H., & Martin, C. A.
- Affiliations
- University of Kentucky (US)
- Corresponding author
- Fillmore, Mark T.
- Venue
- Drug and Alcohol Dependence
- Publisher
- Elsevier BV
- Published
- 2005-02
- Volume
- 77
- Issue
- 2
- Pages
- 151-159
- ISSN
- 0376-8716 (ISSN-L)
- PMC
- PMC3201830
- OpenAlex
- W2054112911
- Cited by
- 53
- References
- 4
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 3 · 2019: 1 · 2018: 2 · 2015: 4 · 2014: 2 · 2013: 2 · 2012: 3
- FWCI
- 1.64
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Drug and Alcohol Dependence (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- University of Kentucky
- National Institute on Drug Abuse (R01 DA14079, P50DA005312, R01DA014079)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
- Keywords
- d-amphetamine, stimulants, information processing, inhibitory control, response inhibition, stop-signal task, dose-dependent effects, subjective effects, physiological effects, healthy adults
- MeSH terms
- Adolescent, Adult, Analysis of Variance, Dextroamphetamine, Dose-Response Relationship, Drug, Double-Blind Method, Female, Humans, Inhibition, Psychological, Male, Mental Processes, Psychomotor Performance
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