  This work evaluates three 3D user interaction techniques to investigate their
visuo-spatial working memory support for users' data exploration in immersive
analytics. Two techniques are the common VR locomotion technique, Walking and
Teleportation, while the other one is Grab, an object manipulation technique.
We present two formal user studies in VR and AR. Our study is designed based on
the Corsi block-tapping Task, a psychological test for assessing visuo-spatial
working memory. Our study results show that Walking supports spatial memory
best, and Grab follows. Though Teleportation is found to support it the least,
participants rated Teleportation as the easiest way to move in the VR study. We
also compare the Walking and Grab results in the VR and AR studies and discuss
differences. At last, we discuss our limitations and future work.
