Some abbreviated words related too open brain imaging data

hello, I have searched it but I could not find any results about it.

this is the article of study.
this is the dataset:

however, I have no idea how to understand following abbreviated terms.a

sans25 d4prime LFLUNOVS CFLUNOVA TRAILB WCSTPSVE WAIS_VOCAB_SCALED WAIS_MATRICS_SCALE LOGIALMEMORY_SCALE FAMILYPICT_SCALE LNS_SCALE SST_SCALE DST_SCALE z_iq_4grp z_wm_4grp z_em_4grp z_ra_4grp z_pos_4grp z_neg_4grp z_dis_4grp fyrschool myrschool