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Chapter 25 Pattern recognition and masking in cochlear implant patients

1993; Elsevier BV; Linguagem: Inglês

10.1016/s0079-6123(08)62286-4

1875-7855

Peter J. Blamey, Gary J. Dooley,

Acoustic Wave Phenomena Research

This chapter focuses on the pattern recognition and masking in cochlear implant patients. The temporal course of masking using pulsatile electrical stimulation provides a sensitive new technique for the investigation of central pattern recognition. The masked threshold for a single-pulse probe is studied for several different maskers as a function of the time between the probe and the start of the masker. These experiments show the gradual development of a temporal pattern in the masked thresholds as the number of pulses in the masker is increased. For a 210 msec masker with pulses at 10 msec intervals, both backward and forward masking thresholds show a well-defined peak at times 10 msec before and after the masker. Probe pulses presented at these times are perceived to be part of the masker pattern and therefore are not easily identified as probe pulses. The chapter discusses a masker with pulses at 20 msec intervals; only backward masking is tested, and the results exhibit a peak approximately 20 msec before the start of the masker, fitting in with the temporal pattern of the masker.