Observations on the psycho-galvanic reflex carried out during some experiments on the process of voluntary 'choice' seemed to show that the reflex corresponds on the psychological side to conation, rather than to emotion, as has usually been supposed. The stronger the conative element (as measured by a classification of the experimental cases based on introspection), the greater the deflection, while cases of deflection occurred in which no emotional element was discovered.

Since the work here recorded was incidental to a psychological study of 'choice', it is at present open to the objection that the observers must have been 'set' to observe conation rather than affection. Control experiments with other introspective 'sets' would seem therefore to be very desirable.