A robotic object hitting task to quantify sensorimotor impairments in participants with stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Robotics

Background:

• Current upper limb function assessments rely on subjective ordinal scales.
• These scales often exhibit limitations such as floor and ceiling effects.
• There is a need for objective measures of upper limb motor control.

Purpose of the Study:

• To develop and validate an objective upper limb motor task.
• To assess the ability to select and engage bilateral hand movements.
• To quantify sensorimotor function in individuals post-stroke.

Main Methods:

• Utilized a bilateral robotic system for precise quantification.
• Participants performed a dynamic object hit task with virtual paddles.
• Task difficulty was progressively increased by varying ball speed and quantity.
• Collected data from 262 controls and 154 stroke survivors.

Main Results:

• Stroke survivors demonstrated significantly lower performance compared to controls.
• Most stroke survivors exhibited asymmetric limb performance in key metrics.
• Individuals with visuospatial neglect showed particularly impaired performance.
• High inter-rater reliability was achieved for task parameters.
• Task parameters correlated significantly with established clinical measures (FIM, BIT).

Conclusions:

• The object hit task offers an objective, rapid assessment of upper limb function.
• It effectively quantifies motor deficits and visuospatial skills post-stroke.
• This task provides a valuable, easy-to-administer clinical tool.