Good CI speech understanding tracks left-hemisphere language network activation while poor understanding does not

Evidence

The CI user with good speech understanding (100 % correct sentences in quiet) shows a generally similar pattern to that of the NH listeners, with left hemisphere dominance but greater activation in frontal areas (Broca’s). In contrast, the CI user with poor speech understanding (< 50 % correct) has very little significant left-hemisphere activity, and little activation out of primary and associated auditory areas. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4304

All NH listeners showed a similar activation pattern in wide language-associated regions in both hemispheres with asymmetry favouring the left hemisphere. The CI user with good speech understanding (100 % correct sentences in quiet) shows a generally similar pattern to that of the NH listeners, with left hemisphere dominance but greater activation in frontal areas (Broca’s). In contrast, the CI user with poor speech understanding (< 50 % correct) has very little significant left-hemisphere activity, and little activation out of primary and associated auditory areas. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4273

The CI user with good speech understanding (100 % correct sentences in quiet) shows a generally similar pattern to that of the NH listeners, with left hemisphere dominance but greater activation in frontal areas (Broca’s). In contrast, the CI user with poor speech understanding (< 50 % correct) has very little significant left-hemisphere activity, and little activation out of primary and associated auditory areas. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4307

Categorization

• XREF: Connects to the left-hemisphere dominance for language concept from aphasia literature, and suggests CI outcomes hinge on engaging the normal language network beyond primary auditory cortex.
• QUESTION: Small sample (single CI user per outcome); worth tracking whether group data confirm the left-hemisphere contrast.
• corroborated: 5 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 4304; Dijk, Pim van, Physiology, Psychoacoustics and…, 4273; Dijk, Pim van, Physiology, Psychoacoustics and…, 4307