Dual tasking in Alzheimer’s disease and depression
Abstract
Alzheimer’s disease (AD) is associated with a marked impairment in the ability to do two things at once, or ‘dual task’. Several studies have reported that depression is also associated with impairments in cognitive functioning, particularly executive functioning, but it remains unclear if depression also leads to impairments in dual tasking ability. Therefore, this paper describes two experiments, assessing (1) dual tasking ability in 50 people with AD and 50 healthy controls, and (2) dual tasking and planning ability, as assessed using the Tower of Hanoi task, in 24 people with depression and 21 healthy controls. The AD group showed marked impairment in dual tasking ability, but the depressed group showed impairment on the Tower of Hanoi task, but preserved performance on the measure of dual tasking. This shows that shows that whereas AD is associated with gross impairment in dual tasking ability, depression is associated with a patchy pattern of impairment across the different cognitive functions, but, importantly, preserved dual tasking ability.
Die Demenz vom Alzheimer-Typ (AD) ist gekennzeichnet durch einen deutliche Einschränkung der Fähigkeit zwei Dinge auf einmal zu tun, d. h. der Fähigkeit zum ′dual-tasking′. Mehrere Studien berichteten dass Depression ebenfalls mit Defiziten kognitiver Funktionen einhergehen, insbesondere der exekutiven Funktionen, aber es blieb unklar ob Depression ebenfalls zu Einschränkungen der Fähigkeit zum dual-tasking führt. Daher beschreibt unsere Studie zwei Experimente zum (1) Untersuchung der Fähigkeit zum dual-tasking bei 50 Personen mit AD im Vergleich zu 50 gesunden Kontrollpersonen, und (2) Dual-Tasking und Planungsfähigkeit, operationalisiert durch die Turm-von-Hanoi-Aufgabe bei 24 depressiv Erkrankten verglichen mit 21 Kontrollpersonen. Die AD-Gruppe zeigte deutliche Beeinträchtigungen in der Fähigkeit zum Dual-Tasking während die depressiv Erkrankten Einrschränkungen beim Turm-von-Hanoi zeigten, aber erhaltene Dual-Tasking-Leistungen. Die zeigt auf, dass während AD mit deutlichen Dual-Tasking-Beeinträchtigungen assoziiert ist Depression mit einem unscharfen Muster von Defiziten verschiedener kognitiver Funktionen verbunden ist, aber – was wichtig ist – mit einer erhaltenen Fähigkeit zum Dual-Tasking.
References
1996). Central executive deficit and response to operant conditioning methods. Neuropsychological Rehabilitation, 6, 161 – 186.
(2000). Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR). Washington, DC: American Psychiatric Association.
(2007). Working memory, thought, and action. Oxford: Oxford University Press.
(1996) “Working memory and executive control”. Philosophical Transactions of the Royal Society of London, Series B, 351, 1397 – 1404.
(2001). Attentional control in Alzheimers disease. Brain, 124, 1492 – 1508.
(1991). The decline of working memory in Alzheimers disease: A longitudinal study. Brain, 114, 2521 – 2542.
(1997). Testing central executive functioning with a pencil-and-paper test. In , Methodology of frontal and executive function (pp. 61 – 80). Hove: Psychology Press.
(1986). Dementia and working memory. Quarterly Journal of Experimental Psychology, 38 A, 603 – 618.
(2004). Executive deficits in elderly patients with major unipolar depression. Journal of Geriatric Psychology and Neurology, 17, 195 – 201.
(1996). Cognitive performance in tests sensitive to frontal lobe dysfunction in the elderly depressed. Psychological Medicine, 26, 591 – 603.
(1988). Clinical Dementia Rating (CDR). Psychopharmacol Bull., 24, 637 – 639.
(1994). Cognitive function in depression: Its relationship to the presence and severity of intellectual decline. Psychological Medicine, 24, 829 – 847.
(1999). Executive function in depression: The role of performance strategies in aiding depressed and non-depressed participants. Journal of Neurology, Neurosurgery & Psychiatry, 66, 162 – 171.
(1993). Working memory in clinical depression: An experimental study. Psychological Medicine, 23, 87 – 91.
(2009). Neurocognitive mechanisms in depression: Implications for treatment. Annual Review of Neuroscience, 32, 57 – 74.
(2007). www.psy.ed.ac.uk/people/view.php?name=sergio-della-sala#test. Accessed 07 Feb 2013.
(1995). Dual-task paradigm: A means to examine the central executive. Annals of the New York Academy of Sciences, 769, 161 – 171.
(2010). Assessing dual task performance using a paper-and-pencil test: Normative data. Archives of Clinical Neuropsychology, 25, 410 – 419.
(1998). The neuropsychological profile in unipolar depression. Trends in Cognitive Sciences, 2, 447 – 454.
(1996). Neuropsychological impairments in unipolar depression: The influence of perceived failure on subsequent performance. Psychological Medicine, 26, 975 – 989.
(2004). Age-related impairment in executive functioning: Updating, inhibition, shifting and access. Journal of Clinical and Experimental Neuropsychology, 7, 874 – 890.
(2010). Dual task performance and post traumatic brain injury. Brain Injury, 24, 851 – 858.
(2011). Dual-task performance in Alzheimer’s disease, Mild Cognitive Impairment, and normal ageing. Archives of Clinical Neuropsychology, 26, 340 – 348.
(2002). Executive functioning in unipolar depression: A review. L’Encéphale, 28, 97 – 107.
(2008). Individual differences in executive function are almost entirely genetic in origin. Journal of Experimental Psychology: General, 137, 201 – 225.
(2009). Cognitive inhibition and working memory in unipolar depression. Journal of Affective Disorders, 116, 100 – 105.
(2001). Cognitive disturbance in outpatient depressed younger adults: Evidence of modest impairment. Biological Psychiatry, 50, 35 – 43.
(2004). Executive functions and updating of the contents of working memory in unipolar depression. Journal of Psychiatric Research, 38, 567 – 576.
(2004). The sensitivity of dual-task performance to cognitive status in aging. Journal of the International Neuropsychological Society, 10, 230 – 238.
(2009). Alzheimer’s Disease, but not ageing or depression, affects dual-tasking. Journal of Neurology, 256, 1860 – 1868.
(2003). Dimensions of executive functioning: Evidence from children. British Journal of Developmental Psychology, 21, 59 – 80.
(2004). Is there a specific executive capacity for dual task coordination? Evidence from Alzheimer’s disease. Neuropsychology, 18, 504 – 513.
(2004). Dual-task interference on encoding and retrieval processes in healthy and impaired working memory. Cortex, 40, 183 – 184.
(2007). Specific AD impairment in concurrent performance of two memory tasks. Cortex, 43, 858 – 865.
(2009). A meta-analysis of depression severity and cognitive function. Journal of Affective Disorders, 119, 1 – 8.
(1984). Clinical diagnosis of Alzheimers disease: report of the NINCDS-ADRDA work group under the auspices of department of Health and Human Services task force on Alzheimers disease. Neurology, 34, 189 – 198.
(1999). Prefrontal cortical dysfunction in depression determined by Wisconsin Card Sorting Test performance. American Journal of Psychiatry, 156, 780 – 782.
(1994). Dual task performance in amnesic and normal people: Does resource depletion cause amnesia? Cortex, 30, 159 – 166.
(2000). The unity and diversity of executive functions and their contributions to complex ‘‘frontal lobe’’ tasks: A latent variable analysis. Cognitive Psychology, 41, 49 – 100.
(1986). Short-term forgetting in senile dementia of the Alzheimer’s type. Cognitive Neuropsychology, 3, 77 – 97.
(1988). Primary and working memory functioning in Alzheimer-type dementia. Journal of Clinical and Experimental Neuropsychology, 10, 279 – 296.
(2001). Relationship of deep white matter hyperintensities and apolipoprotein E genotype to depressive symptoms in older adults without clinical depression. American Journal of Psychiatry, 158, 878 – 884.
(2003). Persistence of cognitive impairment in geriatric patients following antidepressant treatment: A randomized double-blind clinical trial with noritriptyline and paroxetine. Journal of Psychiatric Research, 37, 99 – 108.
(2005). Attention and executive functions in remitted major depression patients. Journal of Affective Disorder, 89, 125 – 135.
(1996). Neuropsychological deficits among older depressed patients with predominantly psychological or vegetative symptoms. Journal of Affective Disorders, 41, 17 – 24.
(2003). Neurocognitive impairment in drug-free patients with major depressive disorder. The British Journal of Psychiatry, 182, 214 – 220.
(1997). Neuropsychological function in young patients with unipolar major depression. Psychological Medicine, 27, 1277 – 1285.
(1976). Standard progressive matrices: Sets A, B, C, D & E. Oxford: Oxford Psychologists Press.
(2007). Persistent cognitive impairment in depression: The role of psychopathology and altered hypothalamic-pituitary-adrenocortical (HPA) system regulation. Biological Psychiatry, 62, 400 – 406.
(1996). Neuropsychology – dementia and affective disorders. British Medical Bulletin, 52, 627 – 643.
(1996). Dissociating executive functions of the prefrontal cortex. Philosophical Transactions of the Royal Society of London, Series B, 351, 1463 – 1471.
(2004). Executive and prefrontal dysfunction in unipolar depression: A review of neuropsychological and imaging evidence. Neuroscience Research, 50, 1 – 11.
(1984). Division of attention: Age differences on a visually presented memory task. Memory & Cognition, 12, 613 – 620.
(2010). Association between cingulum bundle structure and cognitive performance: An observational study in major depression. European Psychiatry, 25, 355 – 360.
(2006). Attentional dysfunction of the central executive in AD: Evidence from dual task and perseveration errors. Cortex, 42, 1015 – 1020.
(1982). Specific impairments of planning. Philosophical Transactions of the Royal Society of London, Series B, 298, 199 – 209.
(1997). A preliminary profile of neuropsychological deficits associated with major depression. Journal of Clinical and Experimental Neuropsychology, 4, 587 – 603.
(