Middle Latency Auditory Evoked Responses in Normal Term Infants: A Longitudinal Study

Abstract

Middle latency auditory evoked responses (MLAERs) were measured in 21 normal term infants, three to five days after birth and then at 6 weeks, 7 months and 1 year of age. A polyphasic waveform was elicited during natural sleep in all infants at each recording session by monaural click stimulation at a rate of 9 per second. A 70 dBHL stimulus was found to be optimal as the MLAER became less well defined when the stimulus intensity approached the threshold hearing level. The first 60 to 70 msec of the waveform was found to be most stable, with decreasing detectability of peaks at longer latencies. There was no change in wave latency or reproducibility of MLAERs recorded during different sleep states. Waves Po and Na showed a significant decrease in latency with increasing stimulus intensity at term and/or 6 weeks of age. This was not evident for the remainder of the waveform. Waves Po, Na, Pa, Nb, Pb and Nc exhibited significant decreases in latency with age, attaining values indistinguishable from adults by 7 months of age.

The Effects of Early and Late Preterm Birth on Brainstem and Middle-Latency Auditory Evoked Responses in Children with Normal Neurodevelopment

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Brain-Machine Interface Training System of Motor Imagery Based on Virtual Reality

“…Thanks to the fast and efficient processing ability of MATLAB and the object-oriented programming design advantages of C#'s, the efficiency of system development was improved, and the system algorithms were updated and maintained. Through the friendly human-computer interaction interface, the efficiency of EEG signal analysis and processing was improved for the BCI researchers; this system realized the multi-algorithm adaptive selection function, aiming at the differences between the individual subjects, and by comparing different algorithms, the algorithm combinations suitable for each subject were selected respectively to obtain the best classification result, thereby improving the universality of the BCI system for the subject (Rogers et al, 1989). Besides, the Unity3D engine was applied in this paper to design a virtual reality software system, providing the first perspective and the third perspective to increase the diversity of the system.…”

Impact of Strong Sound of Starting Guns on the Hearing Loss of Track and Field Athletes Based on Brainstem Auditory Evoked Potential

“…Strong pulse noise and tremor are an acute trauma. The variation of spectral peaks of high-intensity noise is significant and lasts only 1.0-2.0 ms, which can destroy the auditory sensitivity (Rogers et al, 1989).…”