Late auditory evoked potential

Objective To determine an uncomfortable loudness (UCL) level is not an easy task, especially in children. A need to objectively measure this level is crucial as the age of hearing devices candidates is getting younger. Previous studies have shown that the feasibility of habituation correlates in late auditory evoked potentials for a measurement technique of UCL identification is promising. Nevertheless, a scheme that could provide a fast and clear notification of an UCL level is reached is desirable. The present study has introduced a hybrid trial to trial wavelet coherence and novelty detection scheme to extract and to notify objectively the habituation correlates in late auditory evoked potentials. 

Keywords— habituation, wavelet coherence, novelty detection, late auditory evoked potential... 

In [ 5], we introduced an electrophysiological technique which apply the phenomenon of response reduction due to repeatedly stimulation to differentiate between a high intensity responses of 100 decibel (dB) sound pressure level (SPL) and 50 dB SPL. We found that a unique signature (insignificantly habituate) of large-scale neural correlates of habituation in late auditory evoked potentials (LAEPs) when stimidated with lOOdB SPL. In contrast to lOOdB SPL stimrdated response, 50dB SPL stimulated responses showed a clear habituation behavior. 

Mai Mariam, Delb W at al (2009) Comparing the Habituation of Late Auditory Evoked Potentials to Loud and Soft Sound. Physiol Meas 30(2) 141-153... 

Hoppe U, Rosanowski F (2001) Loudness Perception and Late Auditory Evoked Potentials in Adult Cochlear Implant Users. Scand Audiol 30(2) 119-125... 

A decrease in alpha and beta-1 activity as well as an increase in beta-2 activity was elicited by both substances, however, the effects of Hypericum on alpha and beta-2 were less pronounced. In the theta band, an increased activity was found with Hypericum, whereas a decrease in activity was observed with maprotiline. The latencies of auditory evoked potentials in the theta region between 80 and 240 ms as well as the visually evoked potentials in the beta region between 50 and 350 ms decreased substantially on LI 160 treatment. In the case of maprotiline, there was also a decrease in the latencies of visually evoked potentials which was, however less pronounced, especially in the middle and late components which are deemed more relevant [228]. 

Brix R, Gedlicka W (1991) Late Cortical Auditory Potentials Evoked by Electrostimulation in Deaf and Cochlear Implant Patients. Eur Arch Otorhinolaiyngol 248(8) 442-444... 

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