Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia
Patients with Capgras Syndrome (CS) adopt the delusional belief that persons well-known to them have been replaced by an imposter. Several current theoretical models of CS attribute such misidentification problems to deficits in covert recognition processes related to the generation of appropriate a...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2014-09-01
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| Series: | Frontiers in Human Neuroscience |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00726/full |
| _version_ | 1819057409885208576 |
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| author | Chris M. Fiacconi Victoria eBarkley Elizabeth C. Finger Elizabeth C. Finger Nicole eCarson Devin eDuke R. Shayna eRosenbaum R. Shayna eRosenbaum Asaf eGilboa Asaf eGilboa Stefan eKohler Stefan eKohler |
| author_facet | Chris M. Fiacconi Victoria eBarkley Elizabeth C. Finger Elizabeth C. Finger Nicole eCarson Devin eDuke R. Shayna eRosenbaum R. Shayna eRosenbaum Asaf eGilboa Asaf eGilboa Stefan eKohler Stefan eKohler |
| author_sort | Chris M. Fiacconi |
| collection | DOAJ |
| description | Patients with Capgras Syndrome (CS) adopt the delusional belief that persons well-known to them have been replaced by an imposter. Several current theoretical models of CS attribute such misidentification problems to deficits in covert recognition processes related to the generation of appropriate affective autonomic signals. These models assume intact overt recognition processes for the imposter and, more broadly, for other individuals. As such, it has been suggested that CS could reflect the ‘mirror image’ of prosopagnosia. The purpose of the current study was to determine whether overt person recognition abilities are indeed always spared in CS. Furthermore, we examined whether CS might be associated with any impairments in overt affective judgments of facial expressions. We pursued these goals by studying a patient with Lewy Body Dementia (DLB) who showed clear signs of CS, and by comparing him to another patient with DLB who did not experience CS, as well as to a group of healthy control participants. We assessed overt person recognition with three fame recognition tasks, using faces, voices, and names as cues. We also included measures of confidence and probed pertinent semantic knowledge. In addition, participants rated the intensity of fearful facial expressions. We found that CS was associated with overt person recognition deficits when probed with faces and voices, but not with names. Critically, these deficits were not present in the DLB patient without CS. In addition, CS was associated with impairments in overt judgments of affect intensity. Taken together, our findings cast doubt on the traditional view that CS is the mirror-image of prosopagnosia and that it spares overt recognition abilities. These findings can still be accommodated by models of CS that emphasize deficits in autonomic responding, to the extent that the potential role of interoceptive awareness in overt judgments is taken into account. |
| first_indexed | 2024-12-21T13:38:51Z |
| format | Article |
| id | doaj.art-05ceed22f332496fac298c995be9d3f3 |
| institution | Directory Open Access Journal |
| issn | 1662-5161 |
| language | English |
| last_indexed | 2024-12-21T13:38:51Z |
| publishDate | 2014-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Human Neuroscience |
| spelling | doaj.art-05ceed22f332496fac298c995be9d3f32022-12-21T19:02:04ZengFrontiers Media S.A.Frontiers in Human Neuroscience1662-51612014-09-01810.3389/fnhum.2014.00726102674Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body DementiaChris M. Fiacconi0Victoria eBarkley1Elizabeth C. Finger2Elizabeth C. Finger3Nicole eCarson4Devin eDuke5R. Shayna eRosenbaum6R. Shayna eRosenbaum7Asaf eGilboa8Asaf eGilboa9Stefan eKohler10Stefan eKohler11University of Western OntarioYork UniversitySt. Joseph's HospitalUniversity of Western OntarioYork UniversityUniversity of Western OntarioYork UniversityRotman Research InstituteRotman Research InstituteUniversity of TorontoUniversity of Western OntarioRotman Research InstitutePatients with Capgras Syndrome (CS) adopt the delusional belief that persons well-known to them have been replaced by an imposter. Several current theoretical models of CS attribute such misidentification problems to deficits in covert recognition processes related to the generation of appropriate affective autonomic signals. These models assume intact overt recognition processes for the imposter and, more broadly, for other individuals. As such, it has been suggested that CS could reflect the ‘mirror image’ of prosopagnosia. The purpose of the current study was to determine whether overt person recognition abilities are indeed always spared in CS. Furthermore, we examined whether CS might be associated with any impairments in overt affective judgments of facial expressions. We pursued these goals by studying a patient with Lewy Body Dementia (DLB) who showed clear signs of CS, and by comparing him to another patient with DLB who did not experience CS, as well as to a group of healthy control participants. We assessed overt person recognition with three fame recognition tasks, using faces, voices, and names as cues. We also included measures of confidence and probed pertinent semantic knowledge. In addition, participants rated the intensity of fearful facial expressions. We found that CS was associated with overt person recognition deficits when probed with faces and voices, but not with names. Critically, these deficits were not present in the DLB patient without CS. In addition, CS was associated with impairments in overt judgments of affect intensity. Taken together, our findings cast doubt on the traditional view that CS is the mirror-image of prosopagnosia and that it spares overt recognition abilities. These findings can still be accommodated by models of CS that emphasize deficits in autonomic responding, to the extent that the potential role of interoceptive awareness in overt judgments is taken into account.http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00726/fullCapgras SyndromePerson RecognitionInteroceptive AwarenessLewy body dementiaAffect perception |
| spellingShingle | Chris M. Fiacconi Victoria eBarkley Elizabeth C. Finger Elizabeth C. Finger Nicole eCarson Devin eDuke R. Shayna eRosenbaum R. Shayna eRosenbaum Asaf eGilboa Asaf eGilboa Stefan eKohler Stefan eKohler Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia Frontiers in Human Neuroscience Capgras Syndrome Person Recognition Interoceptive Awareness Lewy body dementia Affect perception |
| title | Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia |
| title_full | Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia |
| title_fullStr | Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia |
| title_full_unstemmed | Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia |
| title_short | Nature and Extent of Person Recognition Impairments Associated with Capgras Syndrome in Lewy Body Dementia |
| title_sort | nature and extent of person recognition impairments associated with capgras syndrome in lewy body dementia |
| topic | Capgras Syndrome Person Recognition Interoceptive Awareness Lewy body dementia Affect perception |
| url | http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00726/full |
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