Why not a transposition of the neurons-according to Ramon y Cajal being little erectile bodies in the cells of the cortex, stirred to reflex motor impulse when a message is sent them from the sensory nerves?
"Melomaniacs"
James Huneker
Description: Large and strongly organised; ear-tufts large, erectile; bill strong, fully curved; wing rather long; third quill usually longest; tail short; legs and toes-" "Grace!"
"Peggy"
Laura E. Richards
The old-fashioned shirt-frill which the colonel habitually wore grew erectile with a swelling indignation, possibly half assumed to conceal a certain conscious satisfaction beneath.
"From Sand Hill to Pine"
Bret Harte