title: Loudness perception and speech intensity control in Parkinson's disease.
abstract: The aim of this study was to examine loudness perception in individuals with hypophonia and Parkinson's disease. The participants included 17 individuals with hypophonia related to Parkinson's disease (PD) and 25 age-equivalent controls. The three loudness perception tasks included a magnitude estimation procedure involving a sentence spoken at 60, 65, 70, 75 and 80 dB SPL, an imitation task involving a sentence spoken at 60, 65, 70, 75 and 80 dB SPL, and a magnitude production procedure involving the production of a sentence at five different loudness levels (habitual, two and four times louder and two and four times quieter). The participants with PD produced a significantly different pattern and used a more restricted range than the controls in their perception of speech loudness, imitation of speech intensity, and self-generated estimates of speech loudness. The results support a speech loudness perception deficit in PD involving an abnormal perception of externally generated and self-generated speech intensity.
  
  
  OBJECTIVE
  Readers will recognize that individuals with hypophonia related to Parkinson's disease may demonstrate a speech loudness perception deficit involving the abnormal perception of externally generated and self-generated speech intensity.
authors.affiliation: School of Communication Sciences and Disorders, Western University, London, Ontario, Canada N6G 1H1; Health and Rehabilitation Sciences Program, Western University, London, Ontario, Canada N6G 1H1. Electronic address: jclar246@uwo.ca.
authors.forename: Jenna P
authors.initials: JP
authors.lastname: Clark
authors.affiliation: School of Communication Sciences and Disorders, Western University, London, Ontario, Canada N6G 1H1; Health and Rehabilitation Sciences Program, Western University, London, Ontario, Canada N6G 1H1; Department of Clinical Neuroscience, Western University, London, Ontario, Canada N6G 1H1. Electronic address: sadams@uwo.ca.
authors.forename: Scott G
authors.initials: SG
authors.lastname: Adams
authors.affiliation: School of Communication Sciences and Disorders, Western University, London, Ontario, Canada N6G 1H1; Health and Rehabilitation Sciences Program, Western University, London, Ontario, Canada N6G 1H1. Electronic address: adykstr3@uwo.ca.
authors.forename: Allyson D
authors.initials: AD
authors.lastname: Dykstra
authors.affiliation: School of Communication Sciences and Disorders, Western University, London, Ontario, Canada N6G 1H1. Electronic address: smoodie@uwo.ca.
authors.forename: Shane
authors.initials: S
authors.lastname: Moodie
authors.affiliation: Department of Clinical Neuroscience, Western University, London, Ontario, Canada N6G 1H1. Electronic address: Mandar.Jog@lhsc.on.ca.
authors.forename: Mandar
authors.initials: M
authors.lastname: Jog
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008144:Loudness Perception; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000150:complications* / Q000503:physiopathology; D013060:Speech / Q000502:physiology; D013067:Speech Perception
keywords: Loudness perception; Parkinson's disease; Speech intensity