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A, In-Situ Directivity Index (ISDI) as a function of hearing impairment in omnidirectional mode (open circles) and directional mode (closed circles). In directional mode, ISDI increased as a function of hearing loss; individuals with greater hearing loss tended to be fitted with devices whose microphones were more directional. B, Mean polar patterns for omnidirectional (dotted line) and directional (solid line) for the two groups of listeners.
