Figure 1
From: Synesthesia has specific cognitive processing during Go/No-go paradigms
Stimulus intensity to second and fifth digits for sensory threshold and 2.0-times sensory threshold for synesthete B and 24 non-synesthetes. White circles indicate data on the stimulus intensity for synesthete B. Black circles show data on the stimulus intensity for 24 non-synesthetes. The sensory threshold (× 1.0 ST) for synesthete B is about the average of the 24 non-synesthetes. When set to twice the stimulus intensity, it is located at the value of the dotted arrow. However, synesthete B reported pain and an unpleasant sensation when the stimulus intensity was set to 2.0 times ST. Therefore, the stimulus intensity was set to 1.1 times ST, located at the value indicated by the arrow. ST sensory threshold.
