People with BPD are better at the "Reading the Mind in the Eyes" test
The RMET ("Reading the Mind in the Eyes Test") is a fun test you can take online (here) to gauge how good you are at sensing emotions based on a person's eyes alone. I ended up taking it after my exwBPD declared that I must be autistic based on how terrible I was (according to her) at reading her emotions and sensing her needs. I ended up acing the test, lol.
It made me wonder how people with BPD would perform on the test, and I found an interesting paper which addresses that very question:
Results
The BPD group performed significantly better than the HC [healthy controls] group on the RMET, particularly for the Total Score and Neutral emotional valences. Effect sizes were in the large range for the Total Score and for Neutral RMET performance. The results could not be accounted for by demographics, co-occurring Axis I or II conditions, medication status, abuse history, or emotional state. However, depression severity partially mediated the relationship between RMET and BPD status.
Conclusions
Mental state discrimination based on the eye region of the face is enhanced in BPD. An enhanced sensitivity to the mental states of others may be a basis for the social impairments in BPD.
EDIT: Here's a figure showing the distribution of scores for both men and women. This is from a different paper, so the subjects are taken from the general population, not specifically from people with BPD: