Signal informativeness for sequence structure modulates human auditory cortical responses
| Autor: | Christine Lefebvre, Pierre Jolicœur, Patrick Bermudez, François Vachon, Amour Simal |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male medicine.medical_specialty Cognitive Neuroscience Experimental and Cognitive Psychology Context (language use) Audiology Auditory cortex 050105 experimental psychology Amplitude modulation 03 medical and health sciences Tone (musical instrument) Young Adult 0302 clinical medicine Developmental Neuroscience Event-related potential medicine Humans 0501 psychology and cognitive sciences Biological Psychiatry Sequence (medicine) Auditory Cortex Endocrine and Autonomic Systems General Neuroscience 05 social sciences Electroencephalography Interval (music) Neuropsychology and Physiological Psychology Amplitude Memory Short-Term Neurology Time Perception Evoked Potentials Auditory Female Psychology 030217 neurology & neurosurgery |
| Zdroj: | PsychophysiologyREFERENCES. 58(3) |
| ISSN: | 1540-5958 |
| Popis: | We observed how information about the structure of tone sequences modulates cortical responses in the context of a standard short-term memory (STM) task. Participants heard two sequences of one, three, or five tones (203 ms on, 203 ms off) interspersed by a silent interval (2 s) and decided whether the sequences were the same or different. In experiment 1, sequence length was randomized between trials. During the first sequence, the amplitude of the auditory P2 was larger for the second tone in trials with three tones, and for the second and fourth tone in trials with five tones. We hypothesize the increase in P2 reflected a dynamic disambiguation process because these tones were predictive of a sequence longer than one or three tones. This hypothesis was supported by the absence of P2 amplitude modulation during the second sequence (when sequence length was known). In experiment 2, we blocked trials by sequence length to ensure the effects were not caused by some process related to encoding in STM. There was no P2 amplitude modulation in either the first or second sequences. Thus, tones 2 and 4 had a larger amplitude only when they provided new information about the length of the current tone sequence. To some extent, the auditory N1 also showed those modulations. Independent Component Analysis of the ERPs provided evidence the modulations in P2 amplitude could originate in auditory cortex. These results suggest a rapid dynamic adaptation of auditory cortical responses based on the local informativeness of auditory signals. |
| Databáze: | OpenAIRE |
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