Evaluation of temporal resolution in patients with unilateral temporal lobe epilepsy by the gaps-in-noise test

Temporal lobe epilepsy (TLE) is one of the most frequent epileptic syndromes in adults. Some patients with epilepsy، especially TLE، have central auditory disorders، such as temporal processing، even though they have normal peripheral auditory function. The Gaps-in-Noise (GIN) test is one of the new tests for assessing auditory temporal resolution. The aim of this study was to evaluate temporal resolution ability in patients with unilateral temporal lobe epilepsy. In this cross-sectional and descriptive-analytic study، 25 subjects with temporal lobe epilepsy (11 patients with right temporal lobe epilepsy and 14 patients with left temporal lobe epilepsy) and 18 normal control subjects of 15 to 50 years of age were assessed by the GIN test. Parameters of GIN test were analyzed by one-way ANOVA and compared between the three groups. There was a significant difference in the mean of approximate threshold and percentage of correct answer in GIN test in the right ear، left ear، and mean of both ears between patients with temporal lobe epilepsy and normal subjects (p<0. 05). However، difference between right and left temporal lobe epilepsy groups were not significant (p>0. 05). The lower percentage of correct answer and higher approximate threshold in patients with temporal lobe epilepsy in comparison with the normal control group revealed temporal processing deficiencies especially in temporal resolution abilities. This may be due to involvement of structures related to temporal processing.