Riddoch phenomenon

The Riddoch phenomenon (also known as Riddoch syndrome) is an ocular affectation often caused by lesions in the occipital lobe which limit the sufferer's ability to distinguish objects. Only moving objects in a blind field are visible, static ones being invisible to the patient. The moving objects are not perceived to have color or shape; there is awareness of the movement without perception of it (gnosanopsia).

References

• Reiki, S.; Flytche, D.H. (1998). "The Riddoch syndrome: insights into the neurobiology of conscious vision.". http://brain.oxfordjournals.org/content/121/1/25.abstract. Retrieved 2012-02-02.