attempt to predict when these occur. However, using stimulation we are able to understand those behaviors that occur spontaneously, and understand how stimulating different areas of the brainstem concurrently, alternating between one and the other, can cause different, new, patterns of behavior.

For example, stimulating certain areas of the brainstem, vonHolst found out that if there is any kind of object present, and the electrical stimulation is strong enough, some chickens experienced hallucinations and evoked aggressive behaviors towards the present object. If there was no object present, these hallucinations would not occur and thus, the chicken would instead look around and peck the ground several times; vonHolst compares this behavior to an angry man who may hit a table with his fist if who or what is causing his anger is out of reach. After his experiments vonHolst reached the following conclusions: if we stimulate two brain areas at the same time the following things might occur: a) If the two areas incite two antagonistic behaviors, and they both have the same intensity they cancel each other out b) Two antagonistic behaviors, but one is stronger than the other, usually that behavior trumps the other, even if the weaker behavior has a stronger voltage c) If the animal has a strong drive (chicken with urge to sit but stimulated to stand) and the stimulation passes a certain voltage threshold, one activity dominates over the other (intermediate curve idea) d) The two behaviors occur in full strength and alternate e) The stimulation of the two behaviors generates a third, new unrelated behavior f) The two behaviors combine and generate a hybrid behavior g) The animal is able to balance between the two behaviors rhythmically h) One movement is added to the other.