Mapping the mental space of emotional concepts through kinematic measures of decision uncertainty
Emotional concepts and their mental representations have been extensively studied. Yet, some ecologically relevant aspects, such as how emotional concepts are processed in ambiguous contexts, are incompletely known. We employed a similarity judgment of emotional concepts and manipulated the contextual congruency along the two main affective dimensions of hedonic valence and physiological activation, respectively. Behavioral and kinematics (mouse-tracking) measures were combined to gather a novel ‘similarity index’ between concepts, to derive topographical maps of their mental representations. Self-report (interoceptive sensibility, positive-negative affectivity, depression) and physiological measures (heart rate variability) have been tested to shape the emotional maps. Results indicate that low arousal concepts profit by contextual congruency, with faster responses and reduced uncertainty when contextual ambiguity decreases. The emotional maps exhibit two almost orthogonal axes of valence and arousal, and the similarity measure captures the smooth boundaries between emotions. The emotional map of individuals with low positive affectivity reveals a narrower conceptual distribution, with variations on positive emotions and on emotions with reduced arousal (as individuals with reduced heart rate variability). In sum, our work introduces a novel methodology for delve conceptual representations, bringing the dynamics of decision-making processes and choice uncertainty into the affective domain.