The left hemisphere of the brain is important for all forms of communication. When it is damaged, perhaps as the result of an accident or stroke, there can be serious problems in speaking (this is known as aphasia). After left-hemisphere damage there can also be difficulties with other complicated movements of the mouth, or of the hands and arms Patients with temporal lobe epilepsy (TLE) display a number of cognitive difficulties including memory dysfunction. The temporal lobes are of central importance to auditory perception. Conditions affecting temporal lobe function, such as TLE, may impair auditory perception. The dichotic listening (DL) method consists of simultaneous bilateral presentation of auditory stimuli. It represents a central experimental method for the study of brain asymmetry. Within a study, Fifty right-handed patients with focal temporal lobe epilepsy were administered a dichotic listening test with consonant-vowel syllables under non-forced, forced right and forced left attention conditions, and a neuropsychological test battery. Dichotic listening performance was compare din subgroups with and without left hemisphere cognitive dysfunction, measured by the test battery, and in subgroups with left and right temporal epileptic focus. Left hemisphere cognitive dysfunction led to more correct responses to left ear stimuli in all three attention conditions, and fewer correct responses to right ear stimuli in the non-forced attention condition.
In the DL NF attention condition, the dysfunctional subgroup showed significantly fewer correct responses to right ear stimuli, and significantly more correct responses to left ear stimuli, than the normal subgroup.
Gramstad, A., Engelsen, B. A., & Hugdahl, K. (2006). Dichotic listening with forced attention in patients with temporal lobe epilepsy: Significance of left hemisphere cognitive dysfunction. Scandinavian Journal Of Psychology, 47(3), 163-170. doi:10.1111/j.1467-9450.2006.00503.x
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