Cognitive effects of modafinil in student volunteers may depend on IQ

The results of two previous studies on the effects of modafinil, a selective wakefulness-promoting agent, in healthy university students were combined in a retrospective analysis. This allowed determination of whether the effects of modafinil were dependent on IQ and whether the larger sample size (...

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Published inPharmacology, biochemistry and behavior Vol. 82; no. 1; pp. 133 - 139
Main Authors Randall, Delia C., Shneerson, John M., File, Sandra E.
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Inc 01.09.2005
Elsevier Science
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Abstract The results of two previous studies on the effects of modafinil, a selective wakefulness-promoting agent, in healthy university students were combined in a retrospective analysis. This allowed determination of whether the effects of modafinil were dependent on IQ and whether the larger sample size ( n = 89) would reveal more cognitive benefits. A battery of cognitive tests was completed 2–3 h after dosing. In the whole sample, modafinil (200 mg) significantly reduced the number of missed targets in a test of sustained attention (RVIP). However, interestingly, several interactions between modafinil and IQ emerged. Modafinil (100 and 200 mg) significantly improved target sensitivity in the RVIP test, but only in the group of ‘lower’ IQ (mean ± sem = 106 ± 0.6), not in the ‘higher’ IQ group (mean ± sem = 115.5 ± 0.5). Furthermore, there were significant modafinil × IQ interactions in two further tests. Modafinil significantly reduced speed of responding in a colour naming of dots, and in clock drawing, but only in the ‘lower’ IQ group. Thus, the cognitive benefits of modafinil seem particularly marked in tests of vigilance and speed, in which sleepiness would be an important factor. Furthermore, the results indicate that high IQ may limit detection of modafinil's positive effects.
AbstractList The results of two previous studies on the effects of modafinil, a selective wakefulness-promoting agent, in healthy university students were combined in a retrospective analysis. This allowed determination of whether the effects of modafinil were dependent on IQ and whether the larger sample size (n=89) would reveal more cognitive benefits. A battery of cognitive tests was completed 2-3 h after dosing. In the whole sample, modafinil (200 mg) significantly reduced the number of missed targets in a test of sustained attention (RVIP). However, interestingly, several interactions between modafinil and IQ emerged. Modafinil (100 and 200 mg) significantly improved target sensitivity in the RVIP test, but only in the group of 'lower' IQ (mean+/-sem=106+/-0.6), not in the 'higher' IQ group (mean+/-sem=115.5+/-0.5). Furthermore, there were significant modafinil x IQ interactions in two further tests. Modafinil significantly reduced speed of responding in a colour naming of dots, and in clock drawing, but only in the 'lower' IQ group. Thus, the cognitive benefits of modafinil seem particularly marked in tests of vigilance and speed, in which sleepiness would be an important factor. Furthermore, the results indicate that high IQ may limit detection of modafinil's positive effects.
The results of two previous studies on the effects of modafinil, a selective wakefulness-promoting agent, in healthy university students were combined in a retrospective analysis. This allowed determination of whether the effects of modafinil were dependent on IQ and whether the larger sample size ( n = 89) would reveal more cognitive benefits. A battery of cognitive tests was completed 2–3 h after dosing. In the whole sample, modafinil (200 mg) significantly reduced the number of missed targets in a test of sustained attention (RVIP). However, interestingly, several interactions between modafinil and IQ emerged. Modafinil (100 and 200 mg) significantly improved target sensitivity in the RVIP test, but only in the group of ‘lower’ IQ (mean ± sem = 106 ± 0.6), not in the ‘higher’ IQ group (mean ± sem = 115.5 ± 0.5). Furthermore, there were significant modafinil × IQ interactions in two further tests. Modafinil significantly reduced speed of responding in a colour naming of dots, and in clock drawing, but only in the ‘lower’ IQ group. Thus, the cognitive benefits of modafinil seem particularly marked in tests of vigilance and speed, in which sleepiness would be an important factor. Furthermore, the results indicate that high IQ may limit detection of modafinil's positive effects.
Author File, Sandra E.
Randall, Delia C.
Shneerson, John M.
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Issue 1
Keywords IQ
Cognition
Modafinil
Wakefulness
Sleepiness
Human
CNS stimulant
Psychotropic
Volunteer
Student
Modafmil
Volunteering
Intellectual ability
Intelligence quotient
Language English
License CC BY 4.0
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Elsevier Science
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– volume: 111
  start-page: 703
  year: 2004
  ident: 10.1016/j.pbb.2005.07.019_bib17
  article-title: Motor excitability and motor behaviour after modafinil ingestion—a double-blind placebo-controlled cross-over trial
  publication-title: J Neural Transm
  doi: 10.1007/s00702-004-0111-5
  contributor:
    fullname: Liepert
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Snippet The results of two previous studies on the effects of modafinil, a selective wakefulness-promoting agent, in healthy university students were combined in a...
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StartPage 133
SubjectTerms Adult
Benzhydryl Compounds - pharmacology
Biological and medical sciences
Central Nervous System Stimulants - pharmacology
Cognition
Cognition - drug effects
Female
Humans
Intelligence
Male
Medical sciences
Miscellaneous
Modafinil
Neuropharmacology
Pharmacology. Drug treatments
Sleepiness
Wakefulness
Title Cognitive effects of modafinil in student volunteers may depend on IQ
URI https://dx.doi.org/10.1016/j.pbb.2005.07.019
https://www.ncbi.nlm.nih.gov/pubmed/16140369
https://search.proquest.com/docview/68672699
Volume 82
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