Maximum length sequences -- a fast method for measuring brain-stem-evoked responses.

A technique is described which allows faster evaluation of brain-stem-evoked responses (BER) than the conventional method. It is based on a pseudorandom arrangement of the click stimuli in "maximum length sequences' (MLS). In this way, the responses to each click stimulation can overlap with the responses to other clicks. A simple deconvolution of the averaged response to MLS leads to a click response pattern which is in good agreement with the responses obtained by conventional BER audiometry (BERA). Thus, the procedure for the assessment of BER can be accelerated by a factor of about 6. Repetition rates up to 856 Hz were tested. Even for high repetition rates, the main features of the BER are preserved, although the latency of wave V increases by as much as 1.3 ms.

[1]  N. Sloane,et al.  Hadamard transform optics , 1979 .

[2]  A. Thornton,et al.  The adaptation of cochlear and brainstem auditory evoked potentials in humans. , 1975, Electroencephalography and clinical neurophysiology.

[3]  A. Starr,et al.  Effect of Click Rate on the Latency of Auditory Brain Stem Responses in Humans , 1977, The Annals of otology, rhinology, and laryngology.

[4]  F. Sharbrough,et al.  Detection and localization of occult lesions with brainstem auditory responses. , 1977, Mayo Clinic proceedings.

[5]  M Don,et al.  Analysis of the click-evoked brainstem potentials in man unsing high-pass noise masking. , 1978, The Journal of the Acoustical Society of America.

[6]  M. Schroeder.  Diffuse sound reflection by maximum−length sequences , 1975 .

[7]  Elwyn R. Berlekamp,et al.  Algebraic coding theory , 1984, McGraw-Hill series in systems science.

[8]  D L Jewett,et al.  Volume-conducted potentials in response to auditory stimuli as detected by averaging in the cat. , 1970, Electroencephalography and clinical neurophysiology.

[9]  R. Young,et al.  Brain stem auditory evoked responses: studies of waveform variations in 50 normal human subjects. , 1979, Archives of neurology.

[10]  F. Sharbrough,et al.  Brain-stem auditory-evoked responses. , 1979, Archives of neurology.

[11]  T Graauw,et al.  Pseudo-random binary sequences for multiplex codes. , 1970, Applied optics.