What is the standard for emotional distress in a personal injury case?

"... there is no fixed or absolute standard by which to compute the monetary value of emotional distress, and the jury must necessarily be left to the exercise of a wide discretion, to be restricted by the appellate court only when the sum awarded is so large that the verdict shocks the moral sense and raises a presumption that it must have resulted from passion or prejudice. 'The question of what may be reasonable compensation in cases of this kind is a matter on which there legitimately may be a wide difference of opinion....' " (Fletcher v. Western National Life Ins. Co. (1970) 10 Cal.App.3d 376, 409, 89 Cal.Rptr. 78.)