Though sense organs and nerves are normal, people can interpret sense information incorrectly {agnosia}. Agnosias can be for objects, colors in achromatopsia, faces in prosopagnosia, motions in akinetopsia, or imposters in Capgras syndrome [Bauer and Demery, 2003] [Bridgeman et al., 1997] [Damasio et al., 2000] [Farah, 1990] [Goodale, 2000] [Goodale and Milner, 2004] [Goodale et al., 1994] [Grüsser and Landis, 1991] [Heilman and Valenstein, 2003] [Hu and Goodale, 2000] [Mesulam, 2000] [Milner and Goodale, 1995] [Milner et al., 1991].
People with right-brain damage can deny that they have problems with, or paralysis of, left hand and arm {anosagnosia, disease} {anosodiaphoria}.
People with right-parietal damage think that objects on left reflected in mirrors on right are behind mirrors on right {mirror agnosia} {looking-glass syndrome}.
Left angular-gyrus damage {Gertsmann's syndrome} {Gertsmann syndrome} can cause anomia, finger agnosia, and left/right problems.
Non-dominant, usually right, posterior-parietal-lobe damage can cause ignorance {neglect, vision}| {visuo-spatial hemi-neglect} {hemi-neglect} of stimulus that normally stimulates V1 in opposite, usually left, space half {hemifield}, including opposite body half. Patients do not realize that they cannot see that space side. Right or left Brodmann-area-7 damage can cause neglect of opposite-space half [Berti and Rizolatti, 1992] [Bisiach, 1988] [Bisiach, 1992] [Bisiach and Luzzatti, 1978] [Driver and Mattingley, 1998] [Heilman and Valenstein, 2003] [Heilman et al., 2003] [Husain and Rorden, 2003] [Karnath, 2001] [Karnath et al., 2001] [Marshall and Halligan, 1988] [Mattingley, 1998] [Payne et al., 1996] [Rafal, 1997] [Rees et al., 2000] [Robertson and Marshall, 1993] [Schiller et al., 1979] [Sprague, 1966] [Swick and Knight, 1998] [Vuilleumier et al., 1996] [Vuilleumier et al., 2002].
Non-dominant posterior-parietal-lobe damage can cause neglect when stimulus is in same space half as lobe {extinction, neglect}. In extinction, if something is on one side, people can see object, typically on right side, but they cannot see anything on other side, though brain activity is same in both cases (Geraint Rees).
agnosia
People with neglect can not recognize that they are neglecting space half {anosagnosia, neglect}. People with right-parietal-lobe damage can have paralysis but not know that they have it [Damasio, 1999] [Weiskrantz, 1997]. Perhaps, they have no information receptors for that part. Perhaps, they cannot direct attention there.
realization
People realize that they cannot see that space side if expected information is not available.
People can not know that body parts belong to them {somatoparaphrenia}.
Agnosia can be for faces {prosopagnosia}. Inability to recognize faces involves more than one brain part [Benton and Tranel, 1993] [Perrett et al., 1992] [Tranel and Damasio, 1985] [Wada and Yamamoto, 2001].
After damage to both parietal lobes, people can not perceive more than one object {simultagnosia}, as in Balint syndrome.
4-Medicine-Disease-Kinds-Organ-Nerve
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Date Modified: 2022.0225