Does task complexity influence motor facilitation and visuo-motor memory during mirror therapy in post-stroke...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Motor Control

Background:

• Stroke is a leading cause of mortality and long-term disability worldwide.
• Hemiparesis, characterized by reduced skeletal muscle power, is a common consequence of brain lesions following stroke.
• Mirror therapy has demonstrated efficacy in improving motor performance in post-stroke patients.

Purpose of the Study:

• To investigate if increasing the complexity of mirror tasks enhances top-down motor facilitation and visuo-motor memory demand in stroke patients.
• To explore the neural correlates of altered mirror task complexity using functional near-infrared spectroscopy (fNIRS).

Main Methods:

• A pilot study involving four post-stroke patients was conducted.
• Participants performed a complex finger tapping task within a mirror therapy paradigm.
• Brain activity was assessed using functional near-infrared spectroscopy (fNIRS) to measure changes in the primary motor cortex and precuneus.

Main Results:

• Performing a complex finger tapping task led to increased neural activity in the primary motor cortex and precuneus, ipsilateral to the moving hand.
• Preliminary findings suggest a link between task complexity and enhanced brain activation during mirror therapy.

Conclusions:

• Altering mirror task complexity, specifically through complex finger tapping, may enhance motor facilitation and visuo-motor memory in stroke rehabilitation.
• These pilot findings support the hypotheses that complex tasks and potentially blurred mirror images could augment the benefits of mirror therapy.
• Further investigation with a larger sample size is warranted to confirm these hypotheses and optimize mirror therapy protocols.