Annals of Indian Academy of Neurology
  Users Online: 555 Home | About the Journal | InstructionsCurrent Issue | Back IssuesLogin      Print this page Email this page  Small font size Default font size Increase font size


 
Table of Contents
LETTER TO THE EDITOR
Year : 2015  |  Volume : 18  |  Issue : 1  |  Page : 123-124
 

Pseudo-dementia: A neuropsychological review


1 Clinical Psychology Consultant, Narayana Health City, Bangalore, India
2 Additional Professor, Clinical Psychology, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India

Date of Web Publication10-Feb-2015

Correspondence Address:
Seema Mehrotra
Clinical Psychology, National Institute of Mental Health and Neurosciences, Bangalore-560029, Karnataka
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-2327.144302

Rights and Permissions

 



How to cite this article:
Tripathi R, Mehrotra S. Pseudo-dementia: A neuropsychological review. Ann Indian Acad Neurol 2015;18:123-4

How to cite this URL:
Tripathi R, Mehrotra S. Pseudo-dementia: A neuropsychological review. Ann Indian Acad Neurol [serial online] 2015 [cited 2019 Oct 20];18:123-4. Available from: http://www.annalsofian.org/text.asp?2015/18/1/123/144302


Sir,

We read the recent publication on Pseudo-dementia: A neuropsychological review and found it informative and very interesting. [1] Presence of depression in elderly could be part of dementia itself, and hence, it merits adequate clinical attention. It has been demonstrated that depression can adversely affect neuropsychological functions including attention and concentration, processing speed, and memory. [2],[3],[4] However, it could be debatable whether these cognitive deficits are due to state/trait marker(s) of depression or prodromal phase of dementia. [2] We would like to add our observation in brief regarding the neuropsychology of depressive pseudo-dementia.

In our opinion, several methodological issues need to be taken into consideration because they could confound the findings. Firstly, depression is a heterogeneous condition in terms of severity, duration, and comorbidities. The number of depressive episodes, severity, and duration of each episode are known to affect cognitive functions differently. [2] In addition, other factors such as comorbid conditions, (e.g. presence of psychosis and substance use,) could also complicate the neuropsychological profile. Further, the effects of medication on cognitive functions can create additional complications as several medications are known to affect cognitive functions adversely. [2] Secondly, neuropsychological assessment (procedure) related issues, for example, the use of different neuropsychological tests in different studies, can also complicate the picture. Another important factor is testing time; whether the assessment was done during euthymic state or depressive episode can exert powerful impact on cognition. [4] Therefore, caution needs to be exercised while collating findings from different studies and arriving at conclusions.

Neuropsychological assessment provides an opportunity to examine the functioning brain through observations. In our opinion, behavioral observation during assessment is extremely crucial and vital for test interpretation. Many depressed patients may lack sufficient motivation to complete the task, take more time to complete the task, and report attention or concentration difficulty. Moreover, depressed patients often report memory problem repeatedly and also recollect when and where memory lapses occurred. [3] Contrary to this, demented patients are often less aware of the extent of their cognitive deficits. The patients with dementia are less likely to experience the vegetative features of depression while the depressed patients may often somatize their distress. [3]

Attention (focused) is the fundamental requisite for neuropsychological assessment and inhibition of task-irrelevant information is crucial for adequate cognitive performance. It is well-known that negative automatic thought (NAT) and ruminations are very much part of depression, intrude into the consciousness due to depressive state, and may affect cognition. [4] Patients with depression often exhibit reduced inhibition of these negative materials and find it difficult to disengage attention from irrelevant material (NAT) in order to focus on the ongoing cognitive task. [4] We are tempted to speculate that reduction in cognitive control or inhibition could produce a generalized effect on different cognitive domains rather than cause deficit in an isolated domain.

With regard to neuropsychological profile, it has been consistently reported that depressive pseudo-dementia patients perform relatively better than patients with true dementia and the severity of impairment is noted to be much greater in Alzheimer Dementia. [3] Neuropsychology of dementia has been explored extensively in the last few decades and attention has been shifted to exploring cognitive profile of the preclinical phase (mild cognitive impairment), which can enhance our understanding and enable us to identify early Alzheimer Dementia as well as help us to distinguish it from depressive pseudo-dementia. [3],[5]

Taken together, depression is a heterogeneous condition that could affect several domains of cognition including memory functions, and its relationship with dementia needs to be explored using rigorous research designs and well-defined samples. Clinically, neuropsychological examination findings must be integrated with detailed exploration (regarding onset and presence of cognitive deficits and depression) and careful behavioral observations to enable differentiation of depressive pseudo-dementia from true dementia.

 
   References Top

1.
Kang H, Zhao F, You L, Giorgetta C, Venkatesh D, Sarkhel S, et al. Pseudo-dementia: A neuropsychological review. Ann Indian Acad Neurol 2014;17:147-54.  Back to cited text no. 1
[PUBMED]  Medknow Journal  
2.
McClintock SM, Husain MM, Greer TL, Cullum CM. Association between depression severity and neurocognitive function in major depressive disorder: A review and synthesis. Neuropsychology 2010;24:9-34.  Back to cited text no. 2
    
3.
Lezak MD, Howieson DB, Loring DW, Hannay HJ, Fischer JS. Neuropsychological assessment, 4 th ed. Oxford University Press, New York, NY, US: 2004.  Back to cited text no. 3
    
4.
Gotlib IH, Joormann J. Cognition and depression: Current status and future directions. Annu Rev Clin Psychol 2010; 6:285-312.  Back to cited text no. 4
    
5.
Weintraub S, Wicklund AH, Salmon DP. The neuropsychological profile of Alzheimer disease. Cold Spring Harb Perspect Med 2012;2:a006171.  Back to cited text no. 5
    




 

Top
Print this article  Email this article

    

 
   Search
 
  
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Article in PDF (362 KB)
    Citation Manager
    Access Statistics
    Reader Comments
    Email Alert *
    Add to My List *
* Registration required (free)  


    References

 Article Access Statistics
    Viewed1628    
    Printed25    
    Emailed0    
    PDF Downloaded81    
    Comments [Add]    

Recommend this journal