TY  - RPRT
TI  - Thresholds for movement direction: two directions are less detectable than one.
AU  - G Mather
AU  - B Moulden
PY  - 1983
DO  - 10.1080/14640748308402485
UR  - https://pubmed.ncbi.nlm.nih.gov/6571322/
ID  - 6571322
ER  -