Speech perception deficits in Parkinson's disease: underestimation of time intervals compromises identification of durational phonetic contrasts

How does one night of sleep deprivation affect the internal clock?

“…This provides evidence that the perceptual estimation of segmental duration in speech is governed by a general timing system and favors the idea of a central supramodal and context-independent internal clock. It also enables a better understanding of why patients with Parkinson's disease present deficits in speech perception (Gräber, Hertrich, Daum, Spieker, & Ackermann, 2002). The dopaminergic disorder associated with Parkinson's disease could modify pacemaker rate and hence disrupt segmental duration perception involved in speech perception.…”

Some prosodic characteristics of parkinsonian French speech: Effects of bilateral stimulation of the subthalamic nucleus

“…In comparisons of readings of texts by PD patients and age-matched control subjects, some PD patients were shown to experience speech acceleration (Canter, 1963;Darley et al, 1969;Hammen & Yorkston, 1996) while others spoke more slowly than normal (Gräber, Hertrich, Daum, Spieker, & Ackerman, 2002;Goberman et al, 2005;Ludlow, Connor, & Bassich, 1987). Similar divergences were observed when studying the impact of PD on the two main components of speech rate, articulation rate and pause time.…”

Speech and Swallowing in Parkinson's Disease

“…In one recent study, a subgroup of individuals with PD was unable to use temporal cues in the acoustic speech stream to perceive the t/d contrast in the German words "Boden" and Boten." 38 Another study found that word identification scores for some individuals with PD were reduced for stimuli presented at a slow speech rate. 39 Yet another study suggests that persons with PD demonstrate abnormalities in perceiving speech intensity.…”