Select the statements that describe brain injuries. Brain injuries only affect the brain.

Brain injuries can occur when the brain’s oxygen or glucose supply is interrupted.

Brain injuries can only be caused by physical trauma.

Brain injuries can be caused by infection or intoxication.

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.