If an individual's mind is his personal set of desires, fears and priorities, and if feelings are reactions to realizations of desires, fears and priorities, then what proof, what physical evidence, do we have  or can we find, that proves desires, fears and priorities are realities, that they actually exist, instead of merely being the subjects or content of ideas?

A feeling, as either a sensational or an emotional reaction, is a reaction to a realization of a desire or fear.

A desire is wanting a person, object or event.

Behavior which proves an uncoerced/unstressed individual has a desire can be obtained by the observation of the voluntary approach behavior he exhibits towards a person, object or event, especially a person, object or event the individual says he wants, who/which he says is desirable.

NOTE: A coerced/stressed person may approach a feared person, object or event because he actually has a desire to somehow obtain relief from the coercion/stress from the feared person, object or event. Quite often the individual will exhibit a submissive behavior towards a person person or object (animal—this has been observed in dogs, lions, and gorillas). The Stockholm Syndrome describes how captives sometimes develop emotional attachments to their captors and take up the captives' causes and thereby join their captors out of fear for their lives if they do not.

http://en.wikipedia.org/wiki/Stockholm_syndrome

A fear is not-wanting a person, object or event.

Behavior which proves an uncoerced/unstressed individual has a fear can be proven by the observation of the voluntary avoidance behavior he exhibits away from a person, object or event, especially a person, object or event the individual says he does not want, who/which he says is not desirable.

A priority is the importance of each desire or fear relative to all other desires and fears.

Behavior which proves an uncoerced/unstressed individual has a priority can be obtained by the observation of the strength or degree or urgency of the effort of the voluntary approach behavior he exhibits towards a person, object or event, especially a person, object or event the individual says he wants, who/which he says is desirable. The stronger the effort the stronger the priority.

The term desire can be used to refer to desires, fears and  priorities.

Feelings develop in a sequence:

1. Desire: _____ (?) [Wanting a person, object or event]
2. Realization: _____ (?) [The achievement or non-achievement of the desire]
3A. Emotional Reaction: _____ (?) [The feeling which is one part of the reaction to the realization of the desire]
3B. Impulsive Reaction: _____ (?) [The impulse which is the other part of the reaction to the realization]

The sequence in which feelings develop as reactions to realizations of desires is called the Desire/Realization/Feeling Sequence or D/R/F Sequence.

The D/R/F Sequence is the natural sequence in which feelings develop within a normal person's nervous system.

Thus, feelings would not develop naturally if first there was no desire and second no positive or negative realization of the desire.

An individual can create feelings within himself artificially by ingesting alcohol, drugs or nicotine.

An individual can create feelings artificially in another individual by asking that other individual to voluntarily ingest alcohol, drugs or nicotine (test subjects sometimes will do so voluntarily).

Qualified medical experimenters can create feelings artificially in a volunteer test subject by asking those volunteers to allow them, the experimenters, to stick electrodes into known pleasure and pain centers in their brains (test subjects will sometimes volunteer for this).

An individual can observe the D/R/F Sequence within himself by his own behavior when he gets what he wants or doesn't want and he react to that fact (introspection). An individual has not lived well if he has not celebrated (3B. Impulsive Reaction) because he were happy (3A. Emotional Reaction) because he got the new toy/new car/new job/raise/etc. (2. Realization) he has wanted (1. Desire).

An individual can observe the D/R/F Sequence happening within someone else by that other person's behavior when he gets what he wants or doesn't want and he reacts to that fact. In many cases, an individual can ask a person who is exhibiting happy behavior (celebrating) why he is happy and the chances are excellent that he will say that he is celebrating (3B. Impulsive Reaction) because he is happy (3A. Emotional Reaction) because he just got the new car/job/raise/engagement ring/etc. (2. Positive Realization) he had wanted (1. Desire).

Qualified medical experimenters can also hook someone to a brain scanner and watch what happens when pictures of desirable people, objects and events are presented to the individual. The reaction that is recorded simply would not happen if the individual did not have a pre-existing/relevant desire or fear.

When all the evidence is summarized and analyzed, we have physical evidence consisting of observations including introspections (self-observations) and observations of the approach or avoidance behavior of other individuals and statements by individuals that proves that desires, realizations and feelings are naturally interconnected in the D/R/F Sequence within a normal brain.

When we consider that the term desires can refer to desires, fears and priorities, the physical evidence which proves that desires, realizations and feelings are naturally interconnected in the D/R/F Sequence within a normal brain also proves that desires, fears and priorities are realities, that desires, fears and priorities exist within a normal brain within a normal individual.

When we define an individual's mind to be his personal set of desires, fears and priorities, then, because the physical evidence which proves that desires, realizations and feelings are naturally interconnected in the D/R/F Sequence within a normal brain also proves that desires, fears and priorities are realities, that desires, fears and priorities exist within a normal brain within a normal individual, that same physical evidence also proves that the individual has a personal set of desires, fears and priorities which could be called his mind and therefore that the concept of mind is a real concept.