DYNAmIC SYSTEm APPROACh IN PSYChOLOGY: PROPOSITION AND APPLICATION IN ThE STUDY Of EmOTION, APPRAISAL AND COGNITIVE AChIEVEmENT Journal title: Problems of Psychology in the 21st Century Authors: Cristiano M. A. gomes, hudson F. golino, Bianca C. g. Costa Subject(s): Psychology