Emotional language is all right: Emotional prosody reduces hemispheric asymmetry for linguistic processing

In an influential paper, Bryden and MacRae [(1989). Dichotic laterality effects obtained with emotional words. Neuropsychiatry, Neuropsychology, and Behavioral Neurology, 1, 171-176] introduced a dichotic listening task that allowed for the assessment of linguistic and prosodic processing asymmetries using the same stimuli. The task produces a robust right ear advantage (REA) for linguistic processing (identifying a target word), and a left ear advantage for emotional processing (identifying a target prosody). Here, we adapted this paradigm to determine whether and how the presence of emotional prosody might modulate hemispheric asymmetry for linguistic processing. Participants monitored for a target word among dichotic stimuli consisting of two different words, but spoken in the same emotional prosodyneutral, angry, happy, sad, or fearful. A strong REA was observed when the words were spoken in neutral prosody, which was attenuated for all the emotional prosodies. There were no differences in the ear advantage as a function of valence or discrete emotion, indicating that all emotions had similar effects. Findings are consistent with the hypothesis that the right hemisphere is better able to process speech when it carries emotional prosody. Implications for understanding of right hemisphere language functions are discussed.