Figure 4
From: Thermal referral: evidence for a thermoceptive uniformity illusion without touch

Thermal intensity perception.
Participant reported when the thermode on the forehead reached the same temperature as the overall thermal sensation across index, middle and ring fingers. Overall intensity of physically non-uniform stimulations (middle finger shade present) was judged less intense than uniform patterns. No significant difference was found between purely thermal and thermo-tactile conditions. Error bars show SE across participants.