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Diagram taken from p.499.

The French neurologist Albert Pitres (1848–1928) claimed (p.98) that there were:
(a) zones hypnogènes (‘hypnogenetic zones’), which induced hypnotism when stimulated — “regions… de provoquer instantanément le sommeil hypnotique” (‘zones that provoke hypnotic sleep instantaneously’); and

(b) zones hypnofrénatrices (‘hypno-arresting zones’) — “le font cesser brusquement le sommeil hypnotique” (‘that abruptly terminate the hypnotic sleep’).

Although the locations of the “zones” varied from person to person, they were distinct and constant for any given individual; viz., they had a “position habituelle” (p.497).

According to Pitres, the “zones” are bi-lateral.