Psychophysics is the branch of psychology concerned with the relationships of physical stimuli to sensory processes of organisms, including detection, discriminability, sensations, perceptions, and hedonic judgments. It describes the relationship between physical stimuli and the perceptions they evoke.

 Pain in Humans, Psychophysical Law

 Pain in Humans, Thresholds

 Quantitative Thermal Sensory Testing of Inflamed Skin

 Secondary Somatosensory Cortex (S2) and Insula, Effect on Pain Related Behavior in Animals and Humans

 Spinothalamic Tract Neurons, in Deep Dorsal Horn