TY - RPRT TI - Contour detection threshold: repeatability and learning with 'contour cards'. AU - P M Pennefather AU - A Chandna AU - I Kovacs AU - U Polat AU - A M Norcia PY - 1999 DO - 10.1163/156856899x00157 UR - https://pubmed.ncbi.nlm.nih.gov/10442513/ ID - 10442513 ER -