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. 2015 Apr 1;9:21. doi: 10.3389/fnint.2015.00021

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Copyright © 2015 Zeki.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic diagram to illustrate the variable relationship between awareness and discrimination. In normal subjects, the two are tightly coupled (above). In Riddoch Syndrome patients the two are partially dissociated. This leads to the condition in which Riddoch Syndrome patients are usually, but not always, able to discriminate what they are aware of (with fast moving stimuli) and, conversely are usually unable to discriminate the direction of motion of stimuli of which they are unaware. Modified from Zeki and ffytche (1998).