The researcher who identified 10 basic emotions, most present in infancy, was

The researcher who identified 10 basic emotions, most present in infancy, was Carroll Izard.
 He defined the following 10 basic emotions: joy, interest- excitement, surprise, sadness, anger, disgust, contempt, fear, shame, and guilt, while the two categories are arousal (high vs.low) and valence (pleasant, or positive, versus unpleasant, or negative).

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