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Perception of postural limits during reaching.

S N Robinovitch¹

¹Biomechanics Laboratory Department of Orthopaedic Surgery, San Francisco General Hospital University of California.

Journal of Motor Behavior

|December 29, 2009

Summary

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Participants accurately estimated their reach limits, but underestimated bending reaches and overestimated standing reaches. This suggests perceived abilities are scaled with perceived risk during motor actions.

Area of Science:

Biomechanics
Motor Control
Human Factors

Background:

Understanding the relationship between perceived and actual postural limits is crucial for predicting movement capabilities.
Previous research has explored factors influencing motor performance, but the specific interplay between perceived and actual reach limits requires further investigation.

Purpose of the Study:

To assess the relationship between perceived and actual postural limits in reaching tasks among healthy young and middle-aged adults.
To determine if individuals accurately estimate their maximum reach capabilities in both standing and bending postures.

Main Methods:

Fifty-one healthy participants (young and middle-aged) estimated their maximum reach performance.
Participants then executed maximum reaching movements in both standing and bending conditions.

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Measures of standing and bending reaches were recorded using a tape measure.

Main Results:

Participants demonstrated reasonable accuracy in estimating overall reach limits.
A significant underestimation of bending reach limits and an overestimation of standing reach limits were observed.
The accuracy of perceived bending reach was not correlated with height, weight, age, or gender, but was strongly correlated with the accuracy of perceived standing reach.

Conclusions:

Individuals appear to scale their perceived abilities based on the perceived risk associated with a given action.
A serial strategy, involving summation of perceived arm's length and reach excursion, may be used for estimating bending reach.
These findings highlight the complex cognitive processes underlying motor self-assessment and postural control.