You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The James-Lange Theory is a hypothesis about emotions .
Output:
The James – Lange theory is a hypothesis on the origin and nature of emotions and is one of the earliest theories of emotion within modern psychology .