Table 1. Hierarchy of sensory tasks with cognitive activation.

Sensory task	Difficulty level (low to high)	Cognitive activity required
Kinesthetic	Joint movement discrimination	Recognition of change between presence and absence of movement: “Tell me when you feel the change”
		Recognition of the presence or absence of the movement: “Tell me when you feel that the joint X moves”
	Simple parameter joint movement discrimination	Recognition of the joint moved: “Which joint has been moved?”
		Recognition of the direction of movement of the joint X: “In which direction is it moving?”
	Complex parameter joint movement discrimination	Recognition of the distance of movement in the joint X: “How far has it moved?; In what position are you?”
		Recognition of the static position (spatial relations): “Where is your elbow in relation to your shoulder?”
		Copying spatial relations with the contralateral extremity: “Try to imitate exactly the same position with your other arm”
Tactile	Contact discrimination	Recognition of change between presence and absence of contact “Tell me when there is a change”
		Recognition of the presence or absence of contact “Tell me if you feel there is an area in contact with your palm and fingers”
	Contact location discrimination	Recognition of the contact location: “Where do you feel the contact?”
	Tactile surface discrimination	Recognition of similarities and/or differences: “Is this tactile surface the same or different from the one you felt before?”
		Recognition of touch (surface categorization) “What does this tactile surface feel like?; What surface do you think it is?”