Dec 21, 2004

Neuropharmacology of theophylline induced stuttering: the role of dopamine, adenosine and GABA

Medical Hypotheses
Patrick Movsessian

Abstract

Developmental stuttering is a poorly understood speech disorder that starts out in childhood and some individuals continue to stutter throughout their lives. Stuttering is a disruption in smooth and fluent speech. Some stuttering primarily involves vocal blocks, which are spasms of the laryngeal musculature while prolongations, and repetitions of sound occur in other cases. Acquired stuttering, on the other hand, can occur at all ages and can be caused by brain injury and by pharmacological agents. Theophylline-induced stuttering is form of acquired stuttering. It is a rare side effect of theophylline therapy, but it provides interesting clues to the pharmacological mechanisms involved in stuttering. Theophylline-induced stuttering may involve the disrupt the optimal balance between excitatory and inhibitory neurotransmission throughout the brain by inhibiting GABA receptors. The disruption of the optimal balance between excitatory and inhibitory neurotransmission can also cause dysfunction in white matter fiber tracts such as those that connect the Broca's area to the motor cortex. This leads to a hyperexitation of the motor cortex which may mimic the motor cortex hyperexitability that exists in developmental stuttering. Theop...Continue Reading

  • References24
  • Citations6

Citations

Mentioned in this Paper

Premotor Cortex
Imaging Studies
Left Insula
Limbic System
Receptors, Purinergic P1
Stammering
Assay OF Haloperidol
Tomography, Emission-Computed, Single-Photon
Left Putamen
Purinergic P1 Receptor Antagonists

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