Abstract
Factors influencing the dynamics of auditory restoration, where acoustically missing information is nevertheless perceived, remain unresolved despite their important contributions to sensory cognition. We present the case of perceptual restoration of acoustic rhythms subject to masking and removal. Neurally, in addition to expected acoustically-driven cortical rhythms, cortical rhythms are also observed in response to absent but expected acoustic rhythms, reflecting purely endogenous neural processes. Experimentally, brief noise masker probes were added to a prolonged 5-Hz rhythmic pulse train, and in half those cases the underlying rhythm was also removed. Listeners continually reported whether probes were perceived as rhythmic or not. Analysis of neural responses obtained by magnetoencephalography (MEG) shows that for cases where an absent rhythm was nonetheless perceived as present, the responses contained greater evoked rhythmic power than when the absent rhythm was perceived as absent. Moreover, such...
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