Abstract
Proust detailed inexplicable behavior long before the neurobiologists Goddard and McIntyre in 1972 demonstrated that intermittent repetition of harmless stimuli can cause “kindling” of a seizure (with or without motor convulsions). Such brief seizures can occur especially in the evolutionarily old limbic system which mediates basic drives, their concomitant emotions, and certain aspects of memory. It appears that in humans the influence of specific external stimuli that revive the memory of repeated past experiences may “kindle” a transient episode of limbic overactivation. Thereupon the normal balance between the limbic and frontal lobe systems is disturbed (for a few minutes) as are normal human decision making and control of action. Linked with such a transient frontolimbic imbalance is out-of-character behavior, psychosis (hallucinations or delusions), autonomic activation, and severe distortion of affect and of action, culminating in extreme cases in a “Limbic Psychotic Trigger Reaction,” as proposed by Pontius in 1981, in motiveless homicidal acts with mostly preserved consciousness and memory for the acts.