文摘
To investigate the various generators of the auditory evoked middle-latency responses (MLRs) in human, we recorded the MLRs in 23 normal adults (8 males and 15 females) using a balanced non-cephalic electrode. Recording electrodes were disposed over the 16 points of a scull, and they were chiefly arranged on midline and temporal areas. Click stimuli were delivered monaurally at an intensity of 50 dBHL, and we continued to monitor the background EEG and EOG during a recording session. While a subject was awake, MLR recordings at 1.5 Hz stimulation were carried out, and 8 Hz stimulations were also performed. When a subject was confirmed to be sleep stage 2, we repeated to record at 1.5 Hz stimulation.