Long latency auditory evoked potentials [LAEPs] with different tonal frequencies

Long latency auditory evoked potentials [LAEPs] were recorded in 20 right handed normal hearing adult subjects, 11 males and 9 females. Their ages ranged from 25 to 56 years. Five stimuli with different frequencies were used [click, 500, 1000, 2000 and 4000 Hz]. The response was present in all five different stimuli for all subjects. N1, P2 latencies were longest at 500 Hz, while N1-P2 amplitude was largest at 500 Hz. Females had shorter latencies and larger amplitude than males. Right ears showed shorter latencies and larger amplitude than left ears