Age-Related Differences in Strategy in the Hand Mental Rotation Task

Area of Science:

• Cognitive Neuroscience
• Rehabilitation Science

Background:

• Mental imagery of movement is a promising rehabilitation technique.
• The Hand Mental Rotation Task (HMRT) assesses cognitive strategies: motor imagery (MI) and visual imagery (VI).
• MI involves simulating own movements, showing a medial-lateral effect (faster response time when fingertips point medially).
• VI involves mentally rotating the image, without the medial-lateral effect.

Purpose of the Study:

• To investigate how individual factors influence strategy choice in the HMRT.
• To determine the impact of age, image perspective, and baseline ability on MI vs. VI strategy adoption.
• To understand potential limitations of HMRT in rehabilitation efficacy.

Main Methods:

• Participants performed the HMRT with images of palm-side and back-of-hand views.
• Age groups (young, middle-aged, elderly) and performance ability were considered.
• Strategy use (MI or VI) was inferred based on task performance, particularly the medial-lateral effect.

Main Results:

• When viewing palm-side images, all participants used the MI strategy.
• For back-of-hand images, young adults predominantly used VI.
• In middle-aged and elderly groups, strategy choice depended on performance: high performers used VI, low performers used MI.

Conclusions:

• The strategy adopted in HMRT is influenced by image perspective, age, and performance ability.
• Higher-skilled older adults may not engage in MI, potentially reducing HMRT's rehabilitative benefits.
• Tailoring HMRT protocols based on individual cognitive strategies may be crucial for effective rehabilitation.