1. Copyright © American Speech-Language-Hearing Association
From: Thalamic-Induced Stuttering (Surgical Observations)
J Speech Hear Res. 1991;34(4): doi: /jshr
Legend:
Electrothalamogram: Left thalamic mechanical perturbation induced discharges are illustrated at depths 1.8 cm. (left column) and 1.6 cm. (right column). A low threshold abnormal discharge system was activated. The patient developed spontaneous speech dysfluencies following a 2 mm incremental level of electrode insertion from electrode depth of 1.8 cm to 1.6 cm in the centromedian nucleus. These abnormal discharges were thought to Implicate the premotor reticular network (PMRN) generators that subserve motor speech fluency. EEG recordings: Trace #1 thalamogram = 1 is the central pole and 2 the barrel of the concentric recording electrode. Traces #2 and #3 = electrode 1 and 2 are referred to right frontal scalp (RF). Traces #4–#8 are bipolar scalp EEG recordings. Scalp areas are frontal (F), parietal (P), occipital (O); right and left are (R) and (L) respectively. Insert demonstrates a diagrammatic histologic view of the recording site in the sagittal plane 6.5 mm from the midline. Anatomic Abbreviations: AV: Antero-ventral nucleus; CM: Centromedian nucleus; FM: Fasciculus of Mynert; LM: Lamina medularis Interna; MD: Medial dorsal nucleus; MTH: Mammillothalamic tract; VA: Ventralis anterior nucleus; R: Reticular formation.
Date of download: 10/29/2017
Copyright © American Speech-Language-Hearing Association