Test Retest Reliability of Speech Evoked P300

Abstract

The present study was taken with the aim to assess test retest reliability of speech evoked P300.The main objectives of the study were to access intra session and inter session test-retest reliability of P300 evoked by speech stimuli. 18 normal hearing individuals in the age range of 18 to 30 years participated in the study. Basic audiological evaluations such as pure tone audiometry, speech audiometry and Immitance evaluation were carried out using standard clinical procedures. P300 response was elicited using /da/(frequent) and /ba/ (infrequent) stimuli. To check the intra session reliability recording was repeated after 20 minutes without changing the position of the electrodes. To assess the inter session reliability recording was repeated after two days. Results showed no significant difference in amplitude and latency of P300 across three recording sessions indicating good reliability of P300. Cronbach's alpha revealed moderate to good reliability for P300 latency and amplitude respectively. Reliability estimates were better for intra session recordings compared to inter session recordings.