TY  - RPRT
TI  - Task difficulty and the specificity of perceptual learning.
AU  - M Ahissar
AU  - S Hochstein
PY  - 1997
DO  - 10.1038/387401a0
UR  - https://pubmed.ncbi.nlm.nih.gov/9163425/
ID  - 9163425
ER  -