AUDITORY FREQUENCY FOCUSING IS EXTREMELY RAPID

  • Bertram Scharf
  • Adam Reeves

Abstract

Auditory threshold is 3 to 5 dB higher when signal frequency changes from trial to trial thanwhen the same on every trial. This threshold increase can be avoided by presenting a weakcue at the same frequency as the signal at the beginning of each trial. To achieve thisimprovement, Scharf, Reeves, and Suciu (2007) showed that the cue onset must precede thesignal onset by at least 200 ms. Threshold increased as signal delay decreased from 352 to82 ms. It was unclear whether poorer detection at shorter delays was caused by sluggishnessin focusing on the correct frequency or by interference from the temporally proximate cue.We now show that the threshold at delays at least as short as 52 ms can be ascribed primarilyif not entirely to interference. The implication is that selective frequency focusing is veryrapid.
Section
Full Articles