A. A member of the jury shall not testify as a witness before that jury in the trial of the case in which the juror is sitting. If the juror is called to testify, the opposing party shall be afforded an opportunity to object out of the presence of the jury.

B. Upon an inquiry into the validity of a verdict or indictment, a juror shall not testify as to any matter or statement occurring during the course of the jury's deliberations or as to the effect of anything upon the juror's mind or another juror's mind or emotions as influencing the juror to assent to or dissent from the verdict or indictment or concerning the juror's mental processes during deliberations. A juror may testify on the question whether extraneous prejudicial information was improperly brought to the jury's attention or whether any outside influence was improperly brought to bear upon any juror. An affidavit or evidence of any statement by the juror concerning a matter about which the juror would be precluded from testifying shall not be received for these purposes.