CRITICAL DURATION FOR THE RESOLUTION OF FORM: CENTRALLY OR PERIPHERALLY DETERMINED?

BLOCH'S LAW IS SHOWN TO HOLD FOR A VISUAL ACUITY TASK WITH MONOCULAR AND BINOCULAR VIEWING AS WELL AS IN A CONDITION WHERE THE TARGET WAS PRESENTED TO THE RIGHT AND LEFT EYES IN IMMEDIATE SUCCESSION. THE CRITICAL DURATION IN THE LATTER CONDITION WAS FOUND TO BE APPROXIMATELY DOUBLE THAT IN THE OTHER EXPERIMENTAL CONDITIONS. IT IS CONCLUDED THAT THE CRITICAL DURATION FOR THE RESOLUTION OF FORM IS NOT DETERMINED AT A VISUAL STATION WHERE BINOCULAR SUMMATION OCCURS, I.E., A STATION IN THE VISUAL CORTEX. MOREOVER, THE HYPOTHESIS THAT THE CRITICAL DURATION CORRESPONDS TO A CENTRAL "MOMENT" FAILS TO BE SUPPORTED. (22 REF.) (PsycINFO Database Record (c) 2006 APA, all rights reserved).