Ultrasound Neuromodulation in Essential Tremor

Each ultrasound stimulation protocol will last for 60 seconds, consisting of 4 pulse trains of 5 seconds duration separated by 10 second intervals without stimulation. Across successive stimulation protocols (up to 25/patient) investigators will systematically vary pulse repetition frequency, duty cycle, and acoustic intensity to determine how these parameters contribute to the behavioral effect (transient tremor reduction). Parameters will be shuffled to control for group-level carry over effects and will include sham (unfocused or off-target stimulation) conditions to control for non-specific auditory confounds.

Each ultrasound stimulation protocol will last for 60 seconds, consisting of 4 pulse trains of 5 seconds duration separated by 10 second intervals without stimulation. Across successive stimulation protocols (up to 25/patient) investigators will systematically vary pulse repetition frequency, duty cycle, and acoustic intensity to determine how these parameters contribute to the behavioral effect (transient tremor reduction) in each patient. Parameters will be shuffled to control for group-level carry over effects and will include sham (unfocused or off-target stimulation) conditions to control for non-specific auditory confounds.