Arm movement
Arm movement take up space and thus enlarge the size of the speaker. A speaker who uses big arm movement can intimidate the listener and appear more powerful. In most cultures men tend to use larger gestures than women do.
When a businessman from on the United States wants to emphasize a point in a discussion, he may pound his fist on the table and underline his statement with staccato drumming of the table. Businesswomen in the United states in same situation use far fewer arm and head movement. However, compare with Japanese women, American women use very expressive arm movement.