Publicação
Does hallucinatory predisposition influence voice processing? : probing the interactions between speech, identity, and emotion
| Resumo: | Auditory verbal hallucinations (AVH) are a core symptom of psychotic disorders such as schizophrenia, although similar experiences have been widely reported in nonclinical samples. Due to these observations, a dimensional approach to the understanding of these symptoms has been in discussion: the continuum model of psychosis. One of its assumptions is that the experiences observed in both clinical and nonclinical groups rely on similar cognitive and neural mechanisms. For example, psychotic patients reveal impairments in the recognition of their own speech, often attributing it to an external source, particularly when it carries negative content. This could also be the case in nonclinical samples experiencing hallucinations, although more studies probing voice perception in these individuals are needed, to assess the existence of similar impairments. We recruited nonclinical participants with different scores on the Launay-Slade Hallucination Scale-Revised. They pre-recorded words and vocalizations that were subsequently used in a set of tasks. We assessed voice identity processing at both the discrimination and recognition levels, while taking into account the interactions between the three main voice dimensions: speech, identity, and emotion (Experiment 1). We also wanted to explore if these potential differences could be related to differences in the emotional evaluation of the voice stimuli (Experiment 2). Our results suggest that hallucinatory predisposition is associated with differences in the voice recognition processes: there was an association between lower performance in recognizing one’s own speech and a higher predisposition for auditory hallucinations, particularly when listening to vocalizations not carrying semantic content. We did not find an association between these impairments and negative emotional content of the auditory stimuli, as observed in previous studies with patients. However, our study suggests that the processes involved in the recognition of self-produced vocal stimuli could underlie the experience of auditory hallucinations in nonclinical individuals. |
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| Autores principais: | Fernandes, António João Farinha |
| Assunto: | Esquizofrenia Psicoticismo Alucinações auditivas verbais Reconhecimento de fala Teses de mestrado - 2017 |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Auditory verbal hallucinations (AVH) are a core symptom of psychotic disorders such as schizophrenia, although similar experiences have been widely reported in nonclinical samples. Due to these observations, a dimensional approach to the understanding of these symptoms has been in discussion: the continuum model of psychosis. One of its assumptions is that the experiences observed in both clinical and nonclinical groups rely on similar cognitive and neural mechanisms. For example, psychotic patients reveal impairments in the recognition of their own speech, often attributing it to an external source, particularly when it carries negative content. This could also be the case in nonclinical samples experiencing hallucinations, although more studies probing voice perception in these individuals are needed, to assess the existence of similar impairments. We recruited nonclinical participants with different scores on the Launay-Slade Hallucination Scale-Revised. They pre-recorded words and vocalizations that were subsequently used in a set of tasks. We assessed voice identity processing at both the discrimination and recognition levels, while taking into account the interactions between the three main voice dimensions: speech, identity, and emotion (Experiment 1). We also wanted to explore if these potential differences could be related to differences in the emotional evaluation of the voice stimuli (Experiment 2). Our results suggest that hallucinatory predisposition is associated with differences in the voice recognition processes: there was an association between lower performance in recognizing one’s own speech and a higher predisposition for auditory hallucinations, particularly when listening to vocalizations not carrying semantic content. We did not find an association between these impairments and negative emotional content of the auditory stimuli, as observed in previous studies with patients. However, our study suggests that the processes involved in the recognition of self-produced vocal stimuli could underlie the experience of auditory hallucinations in nonclinical individuals. |
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