epiphenomenon

noun

1. An activity, process, or state that is the result of another; a by-product, a consequence.

   “Yet I would suggest that philosophical and even medical curiosity are only epiphenomenons of another condition that brought deafness to cultural attention.”

   “[R]esource conservation is an epiphenomenon of warfare: a no-man's land between two warring tribes becomes a wildlife refuge because hunters do not visit the area for fear of becoming casualties in the war.”

   “Let's ask the question: Do epiphenomenons of emotions and feelings appear in these artificial brains? If so, where do they appear? It would be difficult to explain how such epiphenomenons might not appear in an artificial neural network, just as it does in a natural network.”

2. A mental process or state that is an incidental by-product of physiological events in the brain or nervous system.

   “It is a necessary corollary of the view here advanced that in instinct as such consciousness is a mere epiphenomenon—a by-product, with no bearing whatever on the performance of the activity in so far as it is instinctive.”

   “According to this hypothesis, mind is a ‘collateral product’ of the physical, an ‘epiphænomenon’ accompanying, but never causally affecting, the physical series of phænomena.”

3. A symptom that develops during the course of a disease that is not connected to the disease.

   “EPIPHÆNOMENA, […] Signs in Diſeaſes which appear afterwards.”

   “The appetite commonly remains little impaired, but it is conjoined with the fear of taking food. The tongue is generally clean, and the taste natural; a contrary state the author considers and denominates an epiphenomenon.”

   “In all cases, the presence of bile in the blood is a mere epiphænomenon, and therefore demands no special attention.”

   “In amenorrhœa, epistaxis is by no means unfrequent; and often relieves the anomalous symptoms, especially those referable to the encephalon, which are the results of the irregular hyperæmia thus induced. The same may be said of it as an epiphænomenon in febrile affections—inflammatory and adynamic,—of which conditions it is often an important symptom.”