失认症（英語：Agnosia）是指由大脑受损而导致的认知障碍。患者在意识正常、无感觉障碍的情况下，对传入的感觉刺激缺乏认识能力，包括物体失认、相貌失认、听觉失认等[1]。須注意的是，此種辨識障礙並非因感覺缺失（如視野缺損，半側無知覺）、智力退化、意識或注意力的異常，對該物體不熟悉而引起。而失認症通常只會在某項感覺模式缺損，因此無法透過一種感覺途徑（如視覺）辨識出的物體，可以透過另一種感覺途徑（如觸覺）來辨識[2]。
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- ^8.08.1Burns, Martha S.Clinical management of agnosia. Topics in Stroke Rehabilitation. 2004,11 (1) [2022-11-12].ISSN 1074-9357.PMID 14872395.doi:10.1310/N13K-YKYQ-3XX1-NFAV. （原始内容存档于2022-11-12）.
- ^Van Lancker, D. R.; Cummings, J. L.; Kreiman, J.; Dobkin, B. H.Phonagnosia: a dissociation between familiar and unfamiliar voices. Cortex; a Journal Devoted to the Study of the Nervous System and Behavior. 1988-06,24 (2) [2022-11-12].ISSN 0010-9452.PMID 3416603.doi:10.1016/s0010-9452(88)80029-7. （原始内容存档于2022-12-06）.
- ^Magnié, M. N.; Ferreira, C. T.; Giusiano, B.; Poncet, M.Category specificity in object agnosia: preservation of sensorimotor experiences related to objects. Neuropsychologia. 1999-01,37 (1) [2022-11-12].ISSN 0028-3932.PMID 9920472.doi:10.1016/s0028-3932(98)00045-1. （原始内容存档于2022-11-13）.
- ^Coslett, H. B.; Saffran, E.Simultanagnosia. To see but not two see. Brain: A Journal of Neurology. 1991-08,. 114 ( Pt 4) [2022-11-12].ISSN 0006-8950.PMID 1884165.doi:10.1093/brain/114.4.1523. （原始内容存档于2022-11-12）.
- ^Reed, C. L.; Caselli, R. J.; Farah, M. J.Tactile agnosia. Underlying impairment and implications for normal tactile object recognition. Brain: A Journal of Neurology. 1996-06,. 119 ( Pt 3) [2022-11-12].ISSN 0006-8950.PMID 8673499.doi:10.1093/brain/119.3.875. （原始内容存档于2022-11-12）.
- ^Mendez, Mario F; Cherrier, Monique M.Agnosia for scenes in topographagnosia. Neuropsychologia. 2003-01-01,41 (10).ISSN 0028-3932.doi:10.1016/S0028-3932(03)00041-1（英语）.
- ^Greene, J. D. W.Apraxia, agnosias, and higher visual function abnormalities. Journal of Neurology, Neurosurgery & Psychiatry. 2005-12-01,76 (suppl 5) [2022-11-12].ISSN 0022-3050.PMC 1765708
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