Weber found that subjects could detect much smaller weight differences when they lifted the weights than when the weights were simply placed in their hands.He attributed this increased sensitivity to:

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Weber attributed the increased sensitivity to kinesthesis, which refers to the sense that detects bodily position, weight, or movement of the muscles, tendons, and joints. This sense is more engaged when actively lifting weights, leading to greater sensitivity in detecting weight differences.

Weber Found That Subjects Could Detect Much Smaller Weight Differences