Final answer:
The references provided do not include information on Briere & Runtz (1989). Further research into their specific study is necessary to understand their discoveries in the field of psychology.
Step-by-step explanation:
The question seems to be derived from the field of psychology, specifically concerning the findings of researchers Briere and Runtz. However, the provided references do not contain information regarding Briere & Runtz (1989) and their discoveries. To provide an accurate and informative answer on what did Briere & Runtz (1989) discover I would need to access the specific study or findings of these researchers.
Without the relevant source or study context it is not possible to give a factual answer to this question. I would recommend consulting the original publication by Briere and Runtz from 1989 for accurate information on their research findings.