Action Control Deficits in Patients With Essential Tremor

Area of Science:

• Neuroscience
• Movement Disorders
• Cognitive Control

Background:

• Essential tremor (ET) is a movement disorder affecting motor execution.
• Disrupted cerebellar-thalamo-cortical networks are implicated in ET.
• Action control, including inhibition, is crucial for daily activities.

Purpose of the Study:

• To investigate action initiation speed in ET.
• To assess response stopping and proactive slowing in ET patients.
• To explore the relationship between ET severity and action control deficits.

Main Methods:

• Thirty-three ET patients and 25 healthy controls (HCs) participated.
• A choice reaction task and a stop-signal task were employed.
• Measures included going speed, proactive slowing, and stop latencies.

Main Results:

• ET patients demonstrated significantly slower action initiation (649 ms vs. 526 ms).
• ET patients exhibited impaired inhibitory control with slower stop signal reaction times (320 ms vs. 258 ms).
• Proactive slowing did not differ between groups; greater ET severity correlated with longer stopping latencies.

Conclusions:

• ET is associated with deficits in action initiation and inhibitory control.
• Proactive slowing appears intact in ET.
• Slower stopping speed in ET may reflect progressive neurobiological changes, warranting further investigation.