The background hypothesis of my thesis is:
"Being aware of the own emotional state is part of being a healthy human."

(Carl Rogers, "The concept of the fully functioning person" in Psychotherapy: Theory, Research and Practice. 1, 1963, Vol. 1.).

The device I developed has two use cases derived from that hypothesis:
Firstly, it can be used as a personal diary that encourages introspection.
Secondly, it can be used as an aid in therapy of some forms of depression. As it allows
a non-verbal expression of emotional states it can be a non-verbal emotion diary the patient
keeps during the week and discusses with the therapist subsequently.

In general, recording emotional states over a long period of time is assumed to be valuable for
personal reflection about different situations in life. If done by a lot of people this data may be also
interesting for the so called "life sciences".

>>> download the introduction as pdf