Cutaneous sensory spots and the “law of specific nerve energies”: history and development of ideas

U Norrsell, S Finger, C Lajonchere - Brain research bulletin, 1999 - Elsevier
By use of suitable methods, different spots on the skin surface can be shown to be
selectively sensitive to one of four sensory qualities in decreasing order of density: pain,
touch, cool and warm. The presence of such spots was observed virtually simultaneously in
the early 1880s by three independent investigators. Two papers on punctuate sensitivity of
the skin were published in 1882 and 1883 by Magnus Blix of Uppsala University in Sweden;
three papers were published in 1884 by Alfred Goldscheider, a German army doctor; and …