psychogalvanic reflex, n.All

The Psychogalvanic reflex (n.) showed ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠Jung the difference: his professor imagining a private pain barely moved the needle, but one name spoken aloud released a deluge of emotion.

A Psychogalvanic reflex (n.) depends ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not on a stimulus's physical strength but on attention and its power to call up associations, usually unconscious; a schoolboy's old society whistle-call moved the needle far more than an ordinary whistle.

The Psychogalvanic reflex (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a change in the skin's electrical resistance that rises with feeling-toned associations, so a galvanometer coupled with the association test makes the emotional charge of a complex visible, as with a teetotaller's hidden drunken crime.