Caffeine Enhances Real-World Language Processing: Evidence from a Proofreading Task

Autor/inn/en	Brunye, Tad T.; Mahoney, Caroline R.; Rapp, David N.; Ditman, Tali; Taylor, Holly A.
Titel	Caffeine Enhances Real-World Language Processing: Evidence from a Proofreading Task
Quelle	In: Journal of Experimental Psychology: Applied, 18 (2012) 1, S.95-108 (14 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1076-898X
DOI	10.1037/a0025851
Schlagwörter	Evidence; Brain Hemisphere Functions; Syllables; Maintenance; Verbs; Pharmacology; Anatomy; Language Processing; Task Analysis; Error Patterns; Cognitive Processes; Correlation; Undergraduate Students; Science Education; Massachusetts + Suchen Sie Ihr Suchwort? Evidenz; Silbe; Arzneikunde; Anatomie; Sprachverarbeitung; Aufgabenanalyse; Fehlertyp; Cognitive process; Kognitiver Prozess; Korrelation; Naturwissenschaftliche Bildung; Master-Studiengang
Abstract	Caffeine has become the most prevalently consumed psychostimulant in the world, but its influences on daily real-world functioning are relatively unknown. The present work investigated the effects of caffeine (0 mg, 100 mg, 200 mg, 400 mg) on a commonplace language task that required readers to identify and correct 4 error types in extended discourse: simple local errors (misspelling 1- to 2-syllable words), complex local errors (misspelling 3- to 5-syllable words), simple global errors (incorrect homophones), and complex global errors (incorrect subject-verb agreement and verb tense). In 2 placebo-controlled, double-blind studies using repeated-measures designs, we found higher detection and repair rates for complex global errors, asymptoting at 200 mg in low consumers (Experiment 1) and peaking at 400 mg in high consumers (Experiment 2). In both cases, covariate analyses demonstrated that arousal state mediated the relationship between caffeine consumption and the detection and repair of complex global errors. Detection and repair rates for the other 3 error types were not affected by caffeine consumption. Taken together, we demonstrate that caffeine has differential effects on error detection and repair as a function of dose and error type, and this relationship is closely tied to caffeine's effects on subjective arousal state. These results support the notion that central nervous system stimulants may enhance global processing of language-based materials and suggest that such effects may originate in caffeine-related right hemisphere brain processes. Implications for understanding the relationships between caffeine consumption and real-world cognitive functioning are discussed. (Contains 1 figure and 2 tables.) (As Provided).
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Update	2017/4/10