Table 1. Summary of the experimental groups and related items.

Group	Observed area	Pain-related	Painful stimulation and intensity
Cc	caudate nucleus	−	−/0 mA
Tc	thalamus	+	−/0 mA
Cs	caudate nucleus	−	+/3 mA
Ts	thalamus	+	+/3 mA
Tss	thalamus	+	+/5 mA