Caffeine Improves Left Hemisphere Processing of Positive Words

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2012 Nov 13

PMID 23144893

Citations 7

Authors

Lars Kuchinke

Vanessa Lux

Affiliations

Soon will be listed here.

Abstract

A positivity advantage is known in emotional word recognition in that positive words are consistently processed faster and with fewer errors compared to emotionally neutral words. A similar advantage is not evident for negative words. Results of divided visual field studies, where stimuli are presented in either the left or right visual field and are initially processed by the contra-lateral brain hemisphere, point to a specificity of the language-dominant left hemisphere. The present study examined this effect by showing that the intake of caffeine further enhanced the recognition performance of positive, but not negative or neutral stimuli compared to a placebo control group. Because this effect was only present in the right visual field/left hemisphere condition, and based on the close link between caffeine intake and dopaminergic transmission, this result points to a dopaminergic explanation of the positivity advantage in emotional word recognition.

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