Effects of Experimental Blinding on Hand Function in Adults

Immanuel Kant posited, “the hand is the visible part of the brain, and hand is outer brain.” The purpose of this study was to determine the Effects of experimental blinding on manual dexterity in adults. Manual dexterity is a skill frequently evaluated in rehabilitation to estimate hand function. In the case of BBT, which reflects large movements, there was no statistically significant difference between the dominant and non-dominant hands for both performance with eyes open and eyes closed. PP reflecting small movements, performing with eyes open had an average of 17.43 in the dominant hand and 15.22 in the non-dominant hand, which was a statistically significant difference (p<.001), and performing with eyes closed had an average of 17.43 in the dominant hand and 15.22 in the non-dominant hand. There was no statistically significant difference between non-dominant hands. In the case of BBT, performance with eyes closed was statistically significantly lower than performance with eyes open in both the dominant and non-dominant hands (p<.001). In the case of PP, performance with eyes closed was statistically significantly lower than performance with eyes open in both the dominant and non-dominant hands (p<.001). For both hand and assembly tasks, performance with eyes closed was statistically significantly lower than performance with eyes open (p<.001). Comparing the percentage change in BBT and PP performance in the dominant hand before and after visual block, performance with eyes open was greater than performance with eyes closed. PP was on average 34.38% more than BBT, and in the non-dominant hand, PP was on average 39.48% more than the box and wood block test, and all were statistically significant (p<.001). It is concluded that fine manual dexterity was more the experimental visual interception of influence than gross manual dexterity. Therefore, it is proposed to include visual blocking in the intervention strategy for efficient rehabilitation treatment.