Age-related deficits in rapid visuomotor decision-making

Area of Science:

• Neuroscience
• Human Aging
• Motor Control

Background:

• Older adults experience declines in vision, decision-making, and motor control, impacting daily activities.
• The dorsal and ventral visual streams mediate visuomotor planning and perceptual identification, respectively.
• Age-related sensory processing changes in these streams may affect visuomotor decision-making.

Purpose of the Study:

• To investigate age-related deficits in the interaction between the dorsal and ventral visual streams during demanding visuomotor tasks.
• To determine if older adults exhibit impaired integration of perceptual information for online action guidance.

Main Methods:

• Older adults (n=15) and young controls (n=26) performed reaching and interception movements towards virtual objects.
• Participants also completed a task requiring goal selection based on object shape.
• Movement strategies and error correction were analyzed during decision-making tasks.

Main Results:

• Older adults corrected fewer initial decision errors in both reaching and interception tasks.
• Older adults made more decision- and execution-related errors during interception, linked to early movement initiation.
• These deficits suggest reduced ability to integrate new perceptual information for online action.

Conclusions:

• Older adults demonstrate impaired visuomotor decision-making and motor execution compared to young adults.
• Reduced integration of perceptual information for online action guidance may underlie these age-related deficits.
• Impaired ventral-dorsal stream interactions likely contribute to functional limitations in older adults.