Cortical FMRI activation to sequences of tones alternating in frequency: relationship to perceived rate and streaming.

Rate and Streaming Alternating in Frequency: Relationship to Perceived Cortical fMRI Activation to Sequences of Tones

Perceptual grouping of alternating word pairs: effect of pitch difference and presentation rate

When listeners hear sequences of tones that slowly alternate between a low frequency and a slightly higher frequency, they tend to report hearing a single stream of alternating tones. However, when the alternation rate and/or the frequency difference increases, they often report hearing two distinct streams: a slowly pulsing high and low frequency stream. This experiment used repeating sequence...

Neuronal Correlates of Auditory Streaming in Monkey Auditory Cortex for Tone Sequences without Spectral Differences

This study finds a neuronal correlate of auditory perceptual streaming in the primary auditory cortex for sequences of tone complexes that have the same amplitude spectrum but a different phase spectrum. Our finding is based on microelectrode recordings of multiunit activity from 270 cortical sites in three awake macaque monkeys. The monkeys were presented with repeated sequences of a tone trip...

Auditory Conflicts and Illusions

Perceptual conflicts appear when the brain receives ambiguous information and needs to choose which of the conflicting pieces of information represents the actual stimulation. In some cases, one piece of information dominates the other ones and we are largely unaware of the conflicting information. In other cases, however, all pieces of information are perceptually equivalent and the brain swit...

Build-up of auditory stream segregation induced by tone sequences of constant or alternating frequency and the resetting effects of single deviants.

A sequence of constant-frequency tones can promote streaming in a subsequent sequence of alternating-frequency tones, but why this effect occurs is not fully understood and its time course has not been investigated. Experiment 1 used a 2.0-s-long constant-frequency inducer (10 repetitions of a low-frequency pure tone) to promote segregation in a subsequent, 1.2-s test sequence of alternating lo...