Extinction (Double simultaneous stimuli)
1. Tactile (sensory)
- with eyes open demonstrate to the patient that you will touch them on the left side, the right side or both.
- this should only be done if the patient can perceive a unilateral stimulus (i.e. if there is loss of pain and temperature or light touch on one side, there would be no point assessing extinction).
- have the patient close their eyes and as you deliver a gentle touch, report whether they feel it on the left side, right side or both sides.
2. Visual extinction
- wiggle a finger in the left, right or both visual fields and ask the patient to report where they see it.
3. Auditory extinction
- snap your fingers on the left, right or both sides and have the patient report where they hear the stimulus.
- when testing for extinction, it is important to deliver bilateral stimuli simultaneously with no time lag in between.