Title

Backward Masking Determination with Early, Middle and Late Evoked Potentials

Presentation Type

Poster

Abstract

Backward Masking (BM) occurs when a tonal stimulus is followed by a noise masker. BM functions have been shown to relate to age, lead toxicity, and in children with language disorders. These functions may be indicative of Auditory Processing Disorder (APD). This study investigated if Evoked Potentials (EP) could be utilized to obtain BM functions. This would be an objective procedure for detemining APD and would be useful in diagnosis. A 10 msec tonal stimulus, a 10 msec Inter-Stimulus Interval (ISI) and a noise masker were used. The subjects were college-aged students with no history of auditory dysfunction. All stimuli will be temporally placed correctly according to the BM stimulus condition. The electrodes were placed at the vertex (Cz, referenced to the right ear) to obtain the evoked potential. A total of 4,000 EEG time epochs were used to determine the summed evoked potentials. Each summed evoked potential comprised 1000 EEG epochs (4 x 1000). The inter-trial interval was 1 sec. The results of the four separate EP’s were compared using subtractive techniques to clearly obtain the changes in the waveform morphology under BM conditions. Results indicated diffential responses depending on the masking condition.

Category

Life Sciences

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Apr 15th, 3:00 PM Apr 15th, 4:00 PM

Backward Masking Determination with Early, Middle and Late Evoked Potentials

Backward Masking (BM) occurs when a tonal stimulus is followed by a noise masker. BM functions have been shown to relate to age, lead toxicity, and in children with language disorders. These functions may be indicative of Auditory Processing Disorder (APD). This study investigated if Evoked Potentials (EP) could be utilized to obtain BM functions. This would be an objective procedure for detemining APD and would be useful in diagnosis. A 10 msec tonal stimulus, a 10 msec Inter-Stimulus Interval (ISI) and a noise masker were used. The subjects were college-aged students with no history of auditory dysfunction. All stimuli will be temporally placed correctly according to the BM stimulus condition. The electrodes were placed at the vertex (Cz, referenced to the right ear) to obtain the evoked potential. A total of 4,000 EEG time epochs were used to determine the summed evoked potentials. Each summed evoked potential comprised 1000 EEG epochs (4 x 1000). The inter-trial interval was 1 sec. The results of the four separate EP’s were compared using subtractive techniques to clearly obtain the changes in the waveform morphology under BM conditions. Results indicated diffential responses depending on the masking condition.