A right handed man had a massive left middle cerebral artery stroke. CT and MRI revealed extensive destruction of both anterior and posterior areas typically associated with language. There was, however, no aphasia, but instead a marked limb apraxia, dyscalculia, dense right visual neglect, and anosognosia. These uncommon dissociations and associations support the hypothesis that cerebral contr...

Speech production is part of the larger motor control system, and as such can be organized into coordinative structures with other motor behaviors that can then be parameterized as single functional units. Previous work has shown the magnitude of movements in coordinated speech and finger tapping covaries across repetitions. The current study expands on this previous work to examine the tempora...

We investigated timing and hemispheric balance of motor cortex activation when kinetically similar speech and non-speech mouth movements and sequences of such movements were triggered by visually presented letter- and symbol-strings. As an index of motor cortex activation, we used magnetoencephalographic recording of task-related change of precentral 20 Hz (16-24 Hz) activity. Suppression of th...

In speech perception, phonetic information can be acquired optically as well as acoustically. The motor theory of speech perception holds that motor control structures are involved in the processing of visible speech, whereas perceptual accounts do not make this assumption. Motor involvement in speech perception was examined by showing participants response-irrelevant movies of a mouth articula...

Speech production is part of the larger motor control system, and as such can be organized into coordinative structures with other motor behaviors that can then be parameterized as single functional units. Previous work has shown the magnitude of movements in coordinated speech and finger tapping covaries across repetitions. The current study expands on this previous work to examine the tempora...

The primary objective of this position paper is to assess the theoretical and empirical support that exists for the Mayo Clinic view of motor speech disorders in general, and for oromotor, nonverbal tasks as a window to speech production processes in particular. Literature both in support of and against the Mayo clinic view and the associated use of oromotor, nonverbal tasks, is reviewed, along...

Preschool and kindergarten teachers must make decisions everyday about how much to allow their children to talk out loud to themselves during various classroom activities. The present study examines the effects of children’s private speech use on task performance for a group of behaviorally at-risk children and a group of control children during a speech–action coordination task. Twenty-nine be...

________________________________________________________ Inner speech monitoring deficit : a study of auditory verbal hallucinations Auditory verbal hallucinations (AVHs) are speech perceptions in the absence of relevant external stimuli. Some accounts of AVHs claim that a deficit in inner speech monitoring causes the own verbal thoughts of the patient to be perceived as external voices. These ...

Listening to speech recruits a network of fronto-temporo-parietal cortical areas. Classical models consider anterior (motor) sites to be involved in speech production whereas posterior sites are considered to be involved in comprehension. This functional segregation is challenged by action-perception theories suggesting that brain circuits for speech articulation and speech perception are funct...