At the present time, there are two measures of response time that are needed:
- The time it takes to grab onto an external support, such as a grab bar, when they feel out of balance. This may be a self-protective response, which would be faster than a self-determined response.
- The time it takes to grab onto any object within their arms reach, when balance looks stable. This too might be classified as self-protective or a separate classification of automatic. The same times would support the idea that grabbing is self-protective.