It has been suggested that speech and hand gestures could form a single system of communication that facilitates the interaction between the speaker and the listener. What kind of information do gestures carry? In the present study, two experiments test the possibility that spontaneous gestures accompanying speech carry prosodic information. Experiment 1 shows that gestures provide prosodic information as adults are able to perceive the congruency between a low-pass filtered thus unintelligible - speech stream and the gestures of the speaker. These results show that prosody is not a modality specific phenomenon and can be perceived in spontaneous gestures that accompany speech.