Neuroscience
Researchers have reported the strange case of a woman who confused her daughters for her sisters and her husband for her deceased father. It appears to be an unusual form of 'delusional misidentification syndrome', of which Capgras syndrome, in which the patient believes their loved ones have been replaced by imposters, is a better known example.
The 74-year-old woman had Alzheimer's disease and excess cerebrospinal fluid in the ventricles of her brain. On top of the memory difficulties typically associated with her illness, she exhibited specific difficulties correctly identifying her relationship with her daughters, sisters and husband.
To investigate just how selective this deficit was, Nobuhito Abe and colleagues tested whether the patient was able to recall the names of her sisters and daughters from photographs, whether she could point to the correct photograph given their names, and if she could recall person-specific information for her sisters and daughters when prompted by their names or photos. She could do all this.
She only tripped up in testing when asked to identify her relationship to her daughters from their name or photo, or if asked to identify the correct names or photos of her relatives according to their relationship to her. For example, asked to recall the names of her sisters, she would list the names of her sisters and daughters.
It wasn't that the woman had lost her conceptual understanding of familial relationships. She was able to verbally define words like 'sister' and 'daughter' and she was able to say how celebrities were related to each other.
The researchers said the case suggests recognising how we are related to others may require a distinct cognitive process that is dissociated from the processing of faces, names and other general information about people.
"The present findings shed further light on the cognitive and neural mechanisms involved in person identification and help refine existing theories related to this issue," the researchers concluded.
The isn't the first case of its kind. In 2003, researchers reported the case of a patient with Alzheimer's disease who mistook his wife for his deceased mother, and later for his living sister.
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Abe, N., Ishii, H., Fujii, T., Ueno, A., Lee, E., Ishioka, T & Mori, E. (2007). Selective impairment in the retrieval of family relationships in person identification: A case study of delusional misidentification. Neuropsychologia, 45, 2902-2909.
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
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Neuroscience
The woman who mistook her daughters for her sisters
Researchers have reported the strange case of a woman who confused her daughters for her sisters and her husband for her deceased father. It appears to be an unusual form of 'delusional misidentification syndrome', of which Capgras syndrome, in which the patient believes their loved ones have been replaced by imposters, is a better known example.The 74-year-old woman had Alzheimer's disease and excess cerebrospinal fluid in the ventricles of her brain. On top of the memory difficulties typically associated with her illness, she exhibited specific difficulties correctly identifying her relationship with her daughters, sisters and husband.
To investigate just how selective this deficit was, Nobuhito Abe and colleagues tested whether the patient was able to recall the names of her sisters and daughters from photographs, whether she could point to the correct photograph given their names, and if she could recall person-specific information for her sisters and daughters when prompted by their names or photos. She could do all this.
She only tripped up in testing when asked to identify her relationship to her daughters from their name or photo, or if asked to identify the correct names or photos of her relatives according to their relationship to her. For example, asked to recall the names of her sisters, she would list the names of her sisters and daughters.
It wasn't that the woman had lost her conceptual understanding of familial relationships. She was able to verbally define words like 'sister' and 'daughter' and she was able to say how celebrities were related to each other.
The researchers said the case suggests recognising how we are related to others may require a distinct cognitive process that is dissociated from the processing of faces, names and other general information about people.
"The present findings shed further light on the cognitive and neural mechanisms involved in person identification and help refine existing theories related to this issue," the researchers concluded.
The isn't the first case of its kind. In 2003, researchers reported the case of a patient with Alzheimer's disease who mistook his wife for his deceased mother, and later for his living sister.
_________________________________
Abe, N., Ishii, H., Fujii, T., Ueno, A., Lee, E., Ishioka, T & Mori, E. (2007). Selective impairment in the retrieval of family relationships in person identification: A case study of delusional misidentification. Neuropsychologia, 45, 2902-2909.
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
- The Man Who Saw A Stranger In The Mirror
The man was diagnosed with Capgras syndromeMirrors easily call forth the uncanny: the vampire that casts no reflection; the figure who seems to appear in your periphery. Overtired or in an odd mood, I sometimes find myself scrutinising my own reflection,...
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Part of the reason boys tear around recklessly having more accidents while girls are more cautious is no doubt due to their biological differences. But it could also have to do with parents treating young boys and girls differently. Now Lisa Hagan and...
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It can be so embarrassing when you bump into a person you haven’t seen for years – you recognise them, you even remember lots of things about them like their job…but you just can’t quite recall their name. This phenomenon has been replicated in...
- Who Replaced All My Things?
Capgras syndrome – in which the patient believes their friends and relatives have been replaced by impersonators – was first described in 1923 by the French psychiatrist J.M.J. Capgras in a paper with J. Reboul-Lachaux. Now Alireza Nejad and Khatereh...
- Tip Of The Fingers Syndrome
We’ve all had that ‘tip of the tongue’ feeling when we’re sure we know the word or name for something but we just can’t think of it. Now a study has shown that a similar phenomenon occurs in American Sign Language (ASL), in what the researchers...