Riddoch phenomenon
Encyclopedia
The Riddoch phenomenon is an ocular affectation often caused by lesion
s 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).
Lesion
A lesion is any abnormality in the tissue of an organism , usually caused by disease or trauma. Lesion is derived from the Latin word laesio which means injury.- Types :...
s in the occipital lobe
Occipital lobe
The occipital lobe is the visual processing center of the mammalian brain containing most of the anatomical region of the visual cortex. The primary visual cortex is Brodmann area 17, commonly called V1...
which limit the sufferer's ability to distinguish objects. Only moving objects in a blind field are visible, static
Static
Static has several meanings:* Static electricity, a net charge of an object** The triboelectric effect, e.g. from shoes rubbing carpet* White noise, a random signal with a flat power spectral density** Noise , a type of radio interference...
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).