The subjective auditory space of epileptic patients with lesions in both the temporal cortical area and the hippocampus


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Abstract

Parameters of the subjective auditory space formed under the conditions of dichotic stimulation during movement of the acoustic image in different directions were studied in 13 epileptic patients with lesions in both the temporal cortex and the hippocampus. The pattern and degree of the movement trajectory of the subjective acoustic image (SAI) were determined in two groups of patients (in seven patients with the right-side focus and six patients with the left-side focus of convulsive activity, depending on the direction of moving and the initial interauricular delay (700, 400, and 200 μs)). A significant decrease in the SAI movement trajectory was observed in patients with right-or the left-side lesions in the temporal cortex and hippocampus as compared to healthy subjects or patients with temporal cortical epilepsy in the cases when the SAI movement stopped at the side of the epileptic focus. The analysis of the parameters of the SAI movement in each hemisphere showed a highly significant difference between the movement trajectories for all values of initial delays as compared to the control group of healthy subjects (p < 0.01) and patients with a relatively isolated lesion of the right temporal cortex (p < 0.05). A significant role of the epileptic lesion of the hippocampus (which is not an auditory structure) in the impairment of spatial hearing was demonstrated. The characteristics of the functional asymmetry because of simultaneous epileptic lesion of the temporal cortex and hippocampus, which led to the impairment of the binaural effect, are discussed.

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