Two-dimensional emotion space mapping. The discrete emotions of EMO-DB are located on the arousal and valence axes. Regarding VAM, four quadrants are considered to evaluate the continuous emotion nature of the database on the arousal-valence axis. The mentioned quadrant's are assigned as "happy/excited" (q1), "angry/anxious" (q2), "sad/bored" (q3), and "relaxed/serene" (q4) [6,30].
Sezgin et al. EURASIP Journal on Audio, Speech, and Music Processing 2012 2012:16 doi:10.1186/1687-4722-2012-16