Differences between clips chosen to contrast were statistically robust. Stimuli were 16 clips from TV programs, two showing relatively strong emotions in each quadrant of activation- evaluation space, each paired with one of the same person in a relatively neural state. An experiment assessed the reliability of the developed system. They include colour coding the pointer in a way that users readily associate with the relevant emotional state presenting key emotion words as 'landmarks' at the strategic points in the space and developing an induction procedure to introduce observers to the system. Prototypes were tested, and in the light of results, refinements were made to ensure that outputs were as consistent and meaningful as possible.

To turn those ideas into a recording tool, the space was represented by a circle on a computer screen, and observers described perceived emotional state by moving a pointer (in the form of a disc) to the appropriate point in the circle, using a mouse. states which are at the limit of emotional intensity define a circle, with alert neutrality at the centre. Research suggests that the space is naturally circular, i.e. The activation dimension measures how dynamic the emotional state is the evaluation dimension is a global measure of the positive or negative feeling associated with the state.

It is based on activation-evaluation space, a representation derived from psychology. FEELTRACE is an instrument developed to let observers track the emotional content of a stimulus as they perceive it over time, allowing the emotional dynamics of speech episodes to be examined.

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