题目选项分析

Linguist: In English, the past is described as "behind" and the future "ahead," whereas in Aymara the past is "ahead" and the future "behind." Research indicates that English speakers sway backward when discussing the past and forward when discussing the future. Conversely, Aymara speakers gesture forward with their hands when discussing the past and backward when discussing the future. These bodily movements, therefore, suggest that the language one speaks affects how one mentally visualizes time.

The linguist's reasoning depends on assuming which of the following?

【选项】Not all English and Aymara speakers tend to sway or gesture forward or backward when discussing the present.