Voice Analysis: Schizophrenia

  • Parola, Simonsen, Bliksted, & Fusaroli (2020)
  • Voice patterns in schizophrenia: A systematic review and Bayesian meta-analysis
  • N papers = 27, N effect sizes = 81, N participants = 1714
  • Last updated: 2020-12-19
  • Curator(s): LNJ, ND
  • Search Strategy: "We adopted the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Guidelines (PRISMA, Stewart et al., 2015) for trans- parent reporting of a systematic review. We pre-registered our protocol by specifying a priori the study rationale, eligibility criteria, search strat- egy, moderator variables, and statistical analyses (see https://bit.ly/ 2EEFeQZ). The literature search was conducted on Pubmed and Google Scholar, the latter including dissertations and unpublished manuscripts. The search terms used were (prosody OR inflection OR intensity OR pitch OR fundamental frequency OR speech rate OR voice quality OR acoustic OR intonation OR vocal) AND (schizo*). The search was con- ducted on August 21 2017, and updated on April 12 2018. We complemented the list by performing a backward and forward literature search: we screened the bibliography of the papers found, and the papers citing them as identified by Google Scholar. Articles were screened for eligibility by two authors (AP and AS).Study selection was conducted according to the following inclusioncriteria: (a) empirical study, (b) quantification of acoustic features inthe vocal production of participants with schizophrenia orschizoaffective disorder1(c) sample including at least two individualswith schizophrenia or schizoaffective disorder, (d) inclusion of a non-clinical comparison group, or an assessment of variation in acoustic fea-tures in relation to severity of clinical features. Clinical comparisongroups (e.g. with depression) were excluded because the limited num-ber of studies did not permit meta-analytic estimations" (Parola et al., 2020)
  • Systematic: yes
  • Voice features: speech_duration, speech_rate, speech_percentage, pause_duration, pause_number, pause_total_length, response_latency, pause_variability, pitch, pitch_variability, pitch_range, f1, f2, f3, f4, f5, f6, formant_bandwidth, formant_amplitude, intensity, intensity_variability