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http://hdl.handle.net/10071/24715
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Campo DC | Valor | Idioma |
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dc.contributor.author | Alderson-Day, B. | - |
dc.contributor.author | Moffatt, J. | - |
dc.contributor.author | Lima, C. F. | - |
dc.contributor.author | Krishnan, S. | - |
dc.contributor.author | Fernyhough, C. | - |
dc.contributor.author | Scott, S. K. | - |
dc.contributor.author | Denton, S. | - |
dc.contributor.author | Leong, I. Y. T. | - |
dc.contributor.author | Oncel, A. D. | - |
dc.contributor.author | Wu, Y.-L. | - |
dc.contributor.author | Zehra Gurbuz | - |
dc.contributor.author | Samuel Evans | - |
dc.date.accessioned | 2022-03-09T11:14:54Z | - |
dc.date.available | 2022-03-09T11:14:54Z | - |
dc.date.issued | 2022 | - |
dc.identifier.issn | 2057-2107 | - |
dc.identifier.uri | http://hdl.handle.net/10071/24715 | - |
dc.description.abstract | Auditory verbal hallucinations (AVHs)—or hearing voices—occur in clinical and non-clinical populations, but their mechanisms remain unclear. Predictive processing models of psychosis have proposed that hallucinations arise from an over-weighting of prior expectations in perception. It is unknown, however, whether this reflects (i) a sensitivity to explicit modulation of prior knowledge or (ii) a pre-existing tendency to spontaneously use such knowledge in ambiguous contexts. Four experiments were conducted to examine this question in healthy participants listening to ambiguous speech stimuli. In experiments 1a (n = 60) and 1b (n = 60), participants discriminated intelligible and unintelligible sine-wave speech before and after exposure to the original language templates (i.e. a modulation of expectation). No relationship was observed between top-down modulation and two common measures of hallucination-proneness.Experiment 2 (n = 99) confirmed this pattern with a different stimulus—sine-vocoded speech (SVS)—that was designed to minimize ceiling effects in discrimination and more closely model previous top-down effects reported in psychosis. In Experiment 3 (n = 134), participants were exposed to SVS without prior knowledge that it contained speech (i.e. naïve listening). AVH-proneness significantly predicted both pre-exposure identification of speech and successful recall for words hidden in SVS, indicating that participants could actually decode the hidden signal spontaneously. Altogether, these findings support a pre-existing tendency to pontaneously draw upon prior knowledge in healthy people prone to AVH, rather than a sensitivity to temporary modulations of expectation. We propose a model of clinical and non-clinical hallucinations, across auditory and visual modalities, with testable predictions for future research. | eng |
dc.language.iso | eng | - |
dc.publisher | Oxford University Press (OUP) | - |
dc.relation | WT108720 | - |
dc.relation | UIDB/03125/2020 | - |
dc.rights | openAccess | - |
dc.subject | Consciousness | eng |
dc.subject | Ketamine anesthesia | eng |
dc.subject | EEG markers of consciousness | eng |
dc.subject | Perturbational complexity index | eng |
dc.title | Susceptibility to auditory hallucinations is associated with spontaneous but not directed modulation of top-down expectations for speech | eng |
dc.type | article | - |
dc.peerreviewed | yes | - |
dc.journal | Neuroscience of Consciousness | - |
dc.volume | 22 | - |
dc.number | 1 | - |
degois.publication.issue | 1 | - |
degois.publication.title | Susceptibility to auditory hallucinations is associated with spontaneous but not directed modulation of top-down expectations for speech | eng |
dc.date.updated | 2022-03-09T11:13:22Z | - |
dc.description.version | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.doi | 10.1093/nc/niac002 | - |
iscte.identifier.ciencia | https://ciencia.iscte-iul.pt/id/ci-pub-86970 | - |
Aparece nas coleções: | CIS-RI - Artigos em revistas científicas internacionais com arbitragem científica |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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article_86970.pdf | Versão Editora | 1,34 MB | Adobe PDF | Ver/Abrir |
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