Abstract: Two experimental studies were presented in this paper : Experiment 1. Expressed anger and suppressed anger eliciting in a laboratory procedure were classified and their different functions on a "detour"task performance were illustrated; Experiment 2. These two types of anger were elicited by the sameprocedure as Experiment 1 and identified by a "seeking" task performance. Heart rate was measured asa verifying index. The results showed that expressed and suppressed anger were clearly classified,illustrating that both eruptive and inhibitory characters of anger definitely existed in infants. Thefunctions of the two types of anger were significantly different on task performance. The performingeffects of expressed anger subjects were superior to suppressed anger subjects.

Key words: expressed anger, suppressed anger, task performance, heart rate, functioning