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  • Title: How to get a left-ear advantage: A technical review of assessing brain asymmetry with dichotic listening.
    Author: Westerhausen R, Kompus K.
    Journal: Scand J Psychol; 2018 Feb; 59(1):66-73. PubMed ID: 29356005.
    Abstract:
    The dichotic-listening paradigm with verbal stimuli is a widely employed behavioral task for the assessment of hemispheric asymmetry for speech and language processing. Participants with assumed left-hemispheric dominance report the right-ear stimulus with higher probability than the left-ear stimulus. However, there is substantial between-subject and trial-to-trial variability observed in the paradigm, motivating scrutiny of the task set-up and theoretical models. Here, we give an in-depth discussion of specific features of stimulus material and experimental parameters, as well as the conditions of stimulus/response selection, which explain a significant proportion of intra- and inter-individual variability. Carefully considering these factors should be at the heart of any experimental planning when using the dichotic-listening paradigm to achieve an optimal testing situation for measuring laterality and avoid confounds in between-subject and between-group comparisons.
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