Transcranial alternating current stimulation in the theta band but not in the delta band modulates the comprehension of naturalistic speech in noise
| Autor: | Shabnam Kadir, Tobias Reichenbach, Mahmoud Keshavarzi, Mikolaj Kegler |
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| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Theta rhythm Computer science Cognitive Neuroscience Speech comprehension Cognitive neuroscience Transcranial Direct Current Stimulation 050105 experimental psychology Speech in noise lcsh:RC321-571 Young Adult 03 medical and health sciences 0302 clinical medicine Rhythm Normal hearing otorhinolaryngologic diseases Humans Waveform 0501 psychology and cognitive sciences Delta and theta frequency bands Theta Rhythm lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry 11 Medical and Health Sciences Transcranial alternating current stimulation Speech envelope Cerebral Cortex Neurology & Neurosurgery 05 social sciences Speech processing 17 Psychology and Cognitive Sciences Comprehension Delta Rhythm Neurology Speech Perception Neural entrainment Speech-shaped-noise Female Noise Entrainment (chronobiology) Neuroscience 030217 neurology & neurosurgery |
| Zdroj: | NeuroImage, Vol 210, Iss, Pp 116557-(2020) |
| ISSN: | 1095-9572 |
| Popis: | Auditory cortical activity entrains to speech rhythms and has been proposed as a mechanism for online speech processing. In particular, neural activity in the theta frequency band (4–8 Hz) tracks the onset of syllables which may aid the parsing of a speech stream. Similarly, cortical activity in the delta band (1–4 Hz) entrains to the onset of words in natural speech and has been found to encode both syntactic as well as semantic information. Such neural entrainment to speech rhythms is not merely an epiphenomenon of other neural processes, but plays a functional role in speech processing: modulating the neural entrainment through transcranial alternating current stimulation influences the speech-related neural activity and modulates the comprehension of degraded speech. However, the distinct functional contributions of the delta- and of the theta-band entrainment to the modulation of speech comprehension have not yet been investigated. Here we use transcranial alternating current stimulation with waveforms derived from the speech envelope and filtered in the delta and theta frequency bands to alter cortical entrainment in both bands separately. We find that transcranial alternating current stimulation in the theta band but not in the delta band impacts speech comprehension. Moreover, we find that transcranial alternating current stimulation with the theta-band portion of the speech envelope can improve speech-in-noise comprehension beyond sham stimulation. Our results show a distinct contribution of the theta- but not of the delta-band stimulation to the modulation of speech comprehension. In addition, our findings open up a potential avenue of enhancing the comprehension of speech in noise. |
| Databáze: | OpenAIRE |
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