This picture in her talk (which is very good, by the way) refers to the study about amygdala hyperreactivity - see below. Essentially the picture shows
fMRI scan differences between controls and borderline patients when looking at
fearful faces. Neutral faces and fixation point were used to transition between the exposure blocks to the emotional faces. Authors state the study points towards the role of greater amygdala activation in borderline patients being a key component to their emotional vulnerability in context of disturbed interpersonal relationships. To put it very simply - borderline patients' amygdala response (i.e. mostly - fear) is more sensitive. The speaker does not talk about the above picture in particular; it rather serves as a general illustration for her presentation.
Donegan, N. H., Sanislow, C. A., Blumberg, H. P., Fulbright, R. K., Lacadie, C., Skudlarski, P., … Wexler, B. E. (2003). Amygdala hyperreactivity in borderline personality disorder: implications for emotional dysregulation. Biological Psychiatry, 54(11), 1284–1293. https://doi.org/10.1016/S0006-3223(03)00636-X
In addition I found a good overview article on neuroimaging in borderline patients:
Lis, E., Greenfield, B., Henry, M., Guilé, J. M., & Dougherty, G. (2007). Neuroimaging and genetics of borderline personality disorder: a review. Journal of Psychiatry & Neuroscience, 32(3), 162–173.