▁( or ▁lack ▁of ▁aw aren ess ▁of ▁defect ) ▁and ▁conf ab ulation , ▁the ▁latter ▁affect ing ▁both ▁speech ▁and ▁behaviour . ▁ ▁Anton ▁synd rome ▁may ▁be ▁thought ▁of ▁ide ally ▁as ▁the ▁opposite ▁of ▁bl inds ight , ▁bl inds ight ▁occurr ing ▁when ▁part ▁of ▁the ▁visual ▁field ▁is ▁not ▁cons ci ously ▁experienced , ▁but ▁some ▁reliable ▁per ception ▁does ▁in ▁fact ▁occur . ▁ ▁C aus es ▁Why ▁patients ▁with ▁Anton ▁synd rome ▁den y ▁their ▁blind ness ▁is ▁unknown , ▁although ▁there ▁are ▁many ▁theories . ▁One ▁hypothesis ▁is ▁that ▁damage ▁to ▁the ▁visual ▁cor tex ▁results ▁in ▁the ▁in ability ▁to ▁communicate ▁with ▁the ▁speech - language ▁areas ▁of ▁the ▁brain . ▁Visual ▁imag ery ▁is ▁received ▁but ▁cannot ▁be ▁interpreted ; ▁the ▁speech ▁cent ers ▁of ▁the ▁brain ▁conf ab ulate ▁a ▁response . ▁ ▁Pat ients ▁have ▁also ▁reported ▁visual ▁anos ogn os ia ▁after ▁experien cing ▁is chem ic ▁v asc ular ▁c ere br al ▁disease . ▁A ▁ 9 6 - year - old ▁man , ▁who ▁was ▁admitted ▁to ▁an ▁emer gency ▁department ▁compla ining ▁of ▁a ▁severe ▁head ache ▁and ▁sudden ▁loss ▁of ▁vision , ▁was ▁discovered ▁to ▁have ▁had ▁a ▁posterior ▁c ere br al ▁ar tery ▁th rom b osis ▁with ▁consequ ent ▁loss ▁of ▁vision . ▁He ▁ad am antly ▁claimed ▁he ▁was ▁able ▁to ▁see ▁despite ▁an ▁o ph th alm olog ic ▁exam ▁prov ing ▁otherwise . ▁An ▁M RI ▁of ▁his