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The Association between High Neuroticism-Low Extraversion and Dual-Task Performance during Walking While Talking in Non-demented Older Adults

Published online by Cambridge University Press:  01 September 2015

Brittany C. LeMonda ,
Jeannette R. Mahoney ,
Joe Verghese  and
Roee Holtzer
Brittany C. LeMonda
Affiliation:
Ferkauf Graduate School of Psychology, Yeshiva University, Bronx, New York
Jeannette R. Mahoney
Affiliation:
Ferkauf Graduate School of Psychology, Yeshiva University, Bronx, New York Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York
Joe Verghese
Affiliation:
Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York Department of Medicine, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York
Roee Holtzer*
Affiliation:
Ferkauf Graduate School of Psychology, Yeshiva University, Bronx, New York Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York
*
Correspondence and reprint requests to: Roee Holtzer, Ferkauf Graduate School of Psychology, Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, 1165 Morris Park Avenue, Bronx, NY 10461. E-mail: [email protected]
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Abstract

The Walking While Talking (WWT) dual-task paradigm is a mobility stress test that predicts major outcomes, including falls, frailty, disability, and mortality in aging. Certain personality traits, such as neuroticism, extraversion, and their combination, have been linked to both cognitive and motor outcomes. We examined whether individual differences in personality dimensions of neuroticism and extraversion predicted dual-task performance decrements (both motor and cognitive) on a WWT task in non-demented older adults. We hypothesized that the combined effect of high neuroticism-low extraversion would be related to greater dual-task costs in gait velocity and cognitive performance in non-demented older adults. Participants (N=295; age range,=65–95 years; female=164) completed the Big Five Inventory and WWT task involving concurrent gait and a serial 7’s subtraction task. Gait velocity was obtained using an instrumented walkway. The high neuroticism-low extraversion group incurred greater dual-task costs (i.e., worse performance) in both gait velocity {95% confidence interval (CI) [−17.68 to −3.07]} and cognitive performance (95% CI [−19.34 to −2.44]) compared to the low neuroticism-high extraversion group, suggesting that high neuroticism-low extraversion interferes with the allocation of attentional resources to competing task demands during the WWT task. Older individuals with high neuroticism-low extraversion may be at higher risk for falls, mobility decline and other adverse outcomes in aging. (JINS, 2015, 21, 519–530)

Keywords

AgingDual-taskingMobilityGaitCognitionPersonality
Type
Research Articles
Information
Journal of the International Neuropsychological Society , Volume 21 , Issue 7 , August 2015 , pp. 519 - 530
Copyright
Copyright © The International Neuropsychological Society 2015 

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References

Attix, D.K., & Welsh-Bohmer, K.A. (2006). Geriatric neuropsychology: Assessment and intervention. New York: Guilford Press.Google Scholar
Ayers, E.I., Tow, A.C., Holtzer, R., & Verghese, J. (2014). Walking while talking and falls in aging. Gerontology, 60(2), 108–113. doi:10.1159/000355119 CrossRefGoogle ScholarPubMed
Barnes, L.L., Mendes de Leon, C.F., Wilson, R.S., Bienias, J.L., & Evans, D.A. (2004). Social resources and cognitive decline in a population of older African Americans and whites. Neurology, 63(12), 2322–2326. doi:10.1212/01.wnl.0000147473.04043.b3 Google Scholar
Bassuk, S.S., Glass, T.A., & Berkman, L.F. (1999). Social disengagement and incident cognitive decline in community-dwelling elderly persons. Annals of Internal Medicine, 131(3), 165–173. doi:10.7326/0003-4819-131-3-199908030-00002 CrossRefGoogle ScholarPubMed
Beauchet, O., Annweiler, C., Dubost, V., Allali, G., Kressig, R.W., Bridenbaugh, S., & Herrmann, F.R. (2009). Stops walking when talking: A predictor of falls in older adults? European Journal of Neurology, 16(7), 786–795. doi:10.1111/j.1468-1331.2009.02612.x Google Scholar
Bolger, N., & Schilling, E.A. (1991). Personality and the problems of everyday life: The role of neuroticism in exposure and reactivity to daily stressors. Journal of Personality, 59(3), 355–386. doi:10.1111/j.1467-6494.1991.tb00253.x Google Scholar
Bootsma-van der Wiel, A., Gussekloo, J., de Craen, A.J., van Exel, E., Bloem, B.R., & Westendorp, R.G. (2003). Walking and talking as predictors of falls in the general population: The Leiden 85-plus study. Journal of the American Geriatrics Society, 51(10), 1466–1471. doi:10.1046/j.1532-5415.2003.51468.x Google Scholar
Calvo, M.G., Alamo, L., & Ramos, P.M. (1990). Test anxiety, motor performance and learning: Attentional and somatic interference. Personality and Individual Differences, 11(1), 29–38. doi:10.1016/0191-8869(90)90165-n Google Scholar
Camicioli, R., Howieson, D., Lehman, S., & Kaye, J. (1997). Talking while walking: The effect of a dual task in aging and Alzheimer’s disease. Neurology, 48(4), 955–958. doi:10.1212/wnl.48.4.955 Google Scholar
Charney, D.S. (2003). Neuroanatomical circuits modulating fear and anxiety behaviors. Acta Psychiatrica Scandinavica, 108(S417), 38–50. doi:10.1034/j.1600-0447.108.s417.3.x Google Scholar
Chu, Y.H., Tang, P.F., Peng, Y.C., & Chen, H.Y. (2012). Meta-analysis of type and complexity of a secondary task during walking on the prediction of elderly falls. Geriatrics & Gerontology International, 13(2), 289–297. doi:10.1111/j.1447-0594.2012.00893.x Google Scholar
Corr, P.J. (2003). Personality and dual-task processing: Disruption of procedural learning by declarative processing. Personality and Individual Differences, 34(7), 1245–1269. doi:10.1016/s0191-8869(02)00112-5 Google Scholar
Crowe, M., Andel, R., Pedersen, N.L., Fratiglioni, L., & Gatz, M. (2006). Personality and risk of cognitive impairment 25 years later. Psychology and Aging, 21(3), 573–580. doi:10.1037/0882-7974.21.3.573 Google Scholar
David, J.P., & Suls, J. (1999). Coping efforts in daily life: Role of big five traits and problem appraisals. Journal of Personality, 67(2), 265–294. doi:10.1111/1467-6494.00056 Google Scholar
Derakshan, N., & Eysenck, M.W. (2009). Anxiety, processing efficiency, and cognitive performance. European Psychologist, 14(2), 168–176. doi:10.1027/1016-9040.14.2.168 CrossRefGoogle Scholar
Duchek, J.M., Balota, D.A., Storandt, M., & Larsen, R. (2007). The power of personality in discriminating between healthy aging and early-stage Alzheimer’s disease. The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences, 62(6), 353–361. doi:10.1093/geronb/62.6.p353 Google Scholar
Ertel, K.A., Glymour, M.M., & Berkman, L.F. (2008). Effects of social integration on preserving memory function in a nationally representative U.S. elderly population. American Journal of Public Health, 98(7), 1215–1220. doi:10.2105/ajph.2007.113654 CrossRefGoogle Scholar
Eysenck, M.W. (1997). Anxiety and cognition: A unified theory. Hove, UK: Psychology Press.Google Scholar
Eysenck, M.W., Derakshan, N., Santos, R., & Calvo, M.G. (2007). Anxiety and cognitive performance: Attentional control theory. Emotion, 7(2), 336–353. doi:10.1037/1528-3542.7.2.336 Google Scholar
Fabrigoule, C., Letenneur, L., Dartigues, J.F., Zarrouk, M., Commenges, D., & Barberger-Gateau, P. (1995). Social and leisure activities and risk of dementia: A prospective longitudinal study. Journal of the American Geriatrics Society, 43(5), 485–490.Google Scholar
Fratiglioni, L., Paillard-Borg, S., & Winblad, B. (2004). An active and socially integrated lifestyle in late life might protect against dementia. The Lancet Neurology, 3(6), 343–353. doi:10.1016/s1474-4422(04)00767-7 CrossRefGoogle ScholarPubMed
Glass, J.M., Schumacher, E.H., Lauber, E.J., Zurbriggen, E.L., Gmeindl, L., Kieras, D.E., & Meyer, D.E. (2000). Aging and the psychological refractory period: Task-coordination strategies in young and old adults. Psychology and Aging, 15(4), 571–595. doi:10.1037//0882-7974.15.4.571 Google Scholar
Gray, J.A. (1981). A critique of Eysenck’s theory of personality. In H.J. Eysenck (Ed.), A model for personality (pp. 246–276). Berlin: Springer-Verlag.CrossRefGoogle Scholar
Gray-Miceli, D., & Quigley, P.A. (2012). Fall prevention: Assessment, diagnoses, and intervention strategies. In M. Boltz, E. Capezuti, T. Fulmer, D. Zwicker, & A. O’Meara (Eds.), Evidence-based geriatric nursing protocols for best practice (4th ed., pp. 268–297). New York: Springer Publishing Company.Google Scholar
Hackney, M.E., & Earhart, G.M. (2010). The effects of a secondary task on forward and backward walking in Parkinson’s disease. Neurorehabilitation and Neural Repair, 24(1), 97–106. doi:10.1177/1545968309341061 Google Scholar
Hartley, A.A. (1992). Attention. In F.I.M. Craik & T.A. Salthouse (Eds.), Handbook of aging and cognition (pp. 1–49). Hillsdale, NJ: Erlbaum.Google Scholar
Hausdorff, J.M., Schweiger, A., Herman, T., Yogev-Seligmann, G., & Giladi, N. (2008). Dual-task decrements in gait: Contributing factors among healthy older adults. The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 63(12), 1335–1343. doi:10.1093/gerona/63.12.1335 Google Scholar
Holtzer, R., Mahoney, J.R., Izzetoglu, M., Izzetoglu, K., Onaral, B., & Verghese, J. (2011). fNIRS study of walking and walking while talking in young and old individuals. The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 66(8), 879–887. doi:10.1093/gerona/glr068 Google Scholar
Holtzer, R., Mahoney, J.R., Izzetoglu, M., Wang, C., England, S., & Verghese, J. (2015). Online fronto-cortical control of simple and attention-demanding locomotion in humans. Neuroimage, 15(112), 152–159. doi:10.1016/j.neuroimage.2015.03.002 Google Scholar
Holtzer, R., Mahoney, J., & Verghese, J. (2014). Intraindividual variability in executive functions but not speed of processing or conflict resolution predicts performance differences in gait speed in older adults. The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 69(8), 980–986.Google Scholar
Holtzer, R., Stern, Y., & Rakitin, B.C. (2004). Age-related differences in executive control of working memory. Memory & Cognition, 32(8), 1333–1345. doi:10.3758/bf03206324 Google Scholar
Holtzer, R., Stern, Y., & Rakitin, B.C. (2005). Predicting age-related dual-task effects with individual differences on neuropsychological tests. Neuropsychology, 19(1), 18–27. doi:10.1037/0894-4105.19.1.18 Google Scholar
Holtzer, R., Verghese, J., Wang, C., Hall, C.B., & Lipton, R.B. (2008). Within-person across-neuropsychological test variability and incident dementia. Joural of American Medical Association, 300(7), 823–830. doi:10.1001/jama.300.7.823 Google Scholar
Holtzer, R., Verghese, J., Xue, X., & Lipton, R.B. (2006). Cognitive processes related to gait velocity: Results from the Einstein aging study. Neuropsychology, 20(2), 215–223. doi:10.1037/0894-4105.20.2.215 Google Scholar
Holtzer, R., Wang, C., & Verghese, J. (2012). The relationship between attenton and gait in aging: Facts and fallacies. Motor Control, 16(1), 64–80.Google Scholar
Holtzer, R., Wang, C., & Verghese, J. (2014). Performance variance on walking while talking tasks: Theory, findings, and clinical implications. Age, 36(1), 373–381. doi:10.1007/s11357-013-9570-7 Google Scholar
Holtzer, R., Wang, C., Lipton, R., & Verghese, J. (2012). The protective effects of executive functions and episodic memory on gait speed decline in aging defined in the context of cognitive reserve. Journal of the American Geriatrics Society, 60(11), 2093–2098. doi:10.1111/j.1532-5415.2012.04193.x Google Scholar
Hultsch, D.F., Hertzog, C., Small, B.J., & Dixon, R.A. (1999). Use it or lose it: Engaged lifestyle as a buffer of cognitive decline in aging? Psychology and Aging, 14(2), 245–263. doi:10.1037//0882-7974.14.2.245 Google Scholar
Jahn, K., Zwergal, A., & Schniepp, R. (2010). Gait disturbance in old age: Classification, diagnosis, and treatment from a neurological perspective. Deutsches Ärzteblatt International, 107(17), 306–315. doi:10.3238/arztebl.2010.0306 Google ScholarPubMed
Jang, Y., Haley, W.E., Mortimer, J.A., & Small, B.J. (2003). Moderating effects of psychosocial attributes on the association between risk factors and disability in later life. Aging & Mental Health, 7(3), 163–170.Google Scholar
John, O.P., Donahue, E.M., & Kentle, R.L. (1991). The big five inventory--versions 4a and 54. Berkeley: University of California, Berkeley, Institute of Personality and Social Research.Google Scholar
John, O.P., & Srivastava, S. (1999). The big-five trait taxonomy: History, measurement, and theoretical perspectives. In L.A. Pervin & O.P. John (Eds.), Handbook of personality: Theory and research (2nd ed., pp. 102–139). New York: Guilford Press.Google Scholar
Jorm, A.F., Mackinnon, A.J., Christensen, H., Henderson, S., Scott, R., & Korten, A. (1993). Cognitive functioning and neuroticism in an elderly community sample. Personality and Individual Differences, 15(6), 721–723. doi:10.1016/0191-8869(93)90013-s Google Scholar
Karp, A., Paillard-Borg, S., Wang, H.X., Silverstein, M., Winblad, B., & Fratiglioni, L. (2006). Mental, physical and social components in leisure activities equally contribute to decrease dementia risk. Dementia and Geriatric Cognitive Disorders, 21(2), 65–73. doi:10.1159/000089919 Google Scholar
Kemper, S., Herman, R.E., & Lian, C.H.T. (2003). The costs of doing two things at once for young and older adults: Talking while walking, finger tapping, and ignoring speech of noise. Psychology and Aging, 18(2), 181–192. doi:10.1037/0882-7974.18.2.181 Google Scholar
Kenny, R., Rubenstein, L.Z., Tinetti, M.E., Brewer, K., Cameron, K.A., Capezuti, E.A., & Lundebjerg, N. (2011). Summary of the updated American Geriatrics Society/British Geriatrics Society clinical practice guideline for prevention of falls in older persons. Journal of the American Geriatrics Society, 59(1), 148–157. doi:10.1111/j.1532-5415.2010.03234.x Google Scholar
Koechlin, E., Ody, C., & Kouneiher, F. (2003). The architecture of cognitive control in the human prefrontal cortex. Science, 302(5648), 1181–1185. doi.org/10.1126/science.1088545302/5648/1181(pii) Google Scholar
Krueger, K.R., Wilson, R.S., Shah, R.C., Tang, Y., & Bennett, D.A. (2006). Personality and incident disability in older persons. Age and Ageing, 35(4), 428–433. doi:10.1093/ageing/afl028 Google Scholar
Li, C., Verghese, J., & Holtzer, R. (2014). A comparison of two walking while talking paradigms in aging. Gait & Posture, 40(3), 415–419. doi:10.1016/j.gaitpost.2014.05.062 Google Scholar
Li, K.Z., Lindenberger, U., Freund, A.M., & Baltes, P.B. (2001). Walking while memorizing: Age-related differences in compensatory behavior. Psychological Science, 12(3), 230–237. doi:10.1111/1467-9280.00341 CrossRefGoogle ScholarPubMed
Lindenberger, U., Marsiske, M., & Baltes, P.B. (2000). Memorizing while walking: Increase in dual-task costs from young adulthood to old age. Psychology and Aging, 15(3), 417–436. doi:10.1037//0882-7974.15.3.417 Google Scholar
Lövdén, M., Ghisletta, P., & Lindenberger, U. (2005). Social participation attenuates decline in perceptual speed in old and very old age. Psychology and Aging, 20(3), 423–434. doi:10.1037/0882-7974.20.3.423 Google Scholar
Lundin-Olsson, L., Nyberg, L., & Gustafson, Y. (1997). “Stops walking when talking” as a predictor of falls in elderly people. The Lancet, 349(9052), 617. doi:10.1016/s0140-6736(97)24009-2 Google Scholar
MacDonald, A.W. III, Cohen, J.D., Stenger, V.A., & Carter, C.S. (2000). Dissociating the role of the dorsolateral prefrontal and anterior cingulate cortex in cognitive control. Science, 288(5472), 1835–1838. doi:10.1126/science.288.5472.1835Google Scholar
Mann, R., Birks, Y., Hall, J., Torgerson, D., & Watt, I. (2006). Exploring the relationship between fear of falling and neuroticism: A cross-sectional study in community dwelling women over 70. Age and Ageing, 35(2), 143–147.Google Scholar
McDonough, A.L., Batavia, M., Chen, F.C., Kwon, S., & Ziai, J. (2001). The validity and reliability of the Gaitrite system: A preliminary evaluation. Archives of Physical Medicine and Rehabilitation, 82(3), 419–425. doi:10.1053/apmr.2001.19778 Google Scholar
Meier, B., Perrig-Chiello, P., & Perrig, W. (2002). Personality and memory in old age. Aging, Neuropsychology, and Cognition, 9(2), 135–144. doi:10.1076/anec.9.2.135.9544 CrossRefGoogle Scholar
Montero-Odasso, M., Bergman, H., Phillips, N.A., Wong, C.H., Sourial, N., & Chertkow, H. (2009). Dual-tasking and gait in people with Mild Cognitive Impairment. The effect of working memory. BMC Geriatrics, 9, 41. doi:10.1186/1471-2318-9-41 Google Scholar
Morris, M., Iansek, R., Smithson, F., & Huxham, F. (2000). Postural instability in Parkinson’s disease: A comparison with and without a concurrent task. Gait & Posture, 12(3), 205–216. doi:10.1016/s0966-6362(00)00076-x Google Scholar
Mroczek, D.K., & Spiro, A. III (2003). Modeling intraindividual change in personality traits: Findings from the normative aging study. The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences, 58(3), 153–165. doi:10.1093/geronb/58.3.p153 Google Scholar
Neupert, S.D., Mroczek, D.K., & Spiro, A. III (2008). Neuroticism moderates the daily relation between stressors and memory failures. Psychology and Aging, 23(2), 287–296. doi:10.1037/0882-7974.23.2.287 Google Scholar
Oh-Park, M., Holtzer, R., Xue, X., & Verghese, J. (2010). Conventional and robust quantitative gait norms in community-dwelling older adults. Journal of the American Geriatrics Society, 58(8), 1512–1518. doi:10.1111/j.1532-5415.2010.02962.x Google Scholar
Pajala, S., Era, P., Koskenvuo, M., Kaprio, J., Alen, M., Tolvanen, A., & Rantanen, T. (2005). Contribution of genetic and environmental factors to individual differences in maximal walking speed with and without second task in older women. The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 60(10), 1299–1303.Google Scholar
Pashler, H. (1994). Dual-task interference in simple tasks: Data and theory. Psychological Bulletin, 116(2), 220–244.Google Scholar
Phan, K.L., Orlichenko, A., Boyd, E., Angstadt, M., Coccaro, E.F., Liberzon, I., & Arfanakis, K. (2009). Preliminary evidence of white matter abnormality in the uncinate fasciculus in generalized social anxiety disorder. Biological Psychiatry, 66(7), 691–694. doi:10.1016/j.biopsych.2009.02.028 Google Scholar
Ponds, R. W. H. M., & Jolles, J. (1996). Memory complaints in elderly people: The role of memory abilities, metamemory, depression, and personality. Educational Gerontology, 22(4), 341–357. doi:10.1080/0360127960220404 Google Scholar
Randolph, C., Tierney, M.C., Mohr, E., & Chase, T.N. (1998). The repeatable battery for the assessment of neuropsychological status (RBANS): Preliminary clinical validity. Journal of Clinical and Experimental Neuropsychology, 20(3), 310–319. doi:10.1076/jcen.20.3.310.823 Google Scholar
Rauch, S.L., Savage, C.R., Alpert, N.M., Dougherty, D., Kendrick, A., Curran, T., & Jenike, M.A. (1997). Probing striatal function in obsessive compulsive disorder using PET and a sequence learning task. Journal of Neuropsychiatry and Clinical Neurosciences, 9(1), 568–573.Google Scholar
Rhodes, R.E., & Smith, N.E. (2006). Personality correlates of physical activity. British Journal of Sports Medicine, 40(12), 958–965.Google Scholar
Robinson, D. (2001). How brain arousal systems determine different temperament types and the major dimensions of personality. Personality and Individual Differences, 31(8), 1233–1259. doi:10.1016/s0191-8869(00)00211-7 Google Scholar
Saczynski, J.S., Pfeifer, L.A., Masaki, K., Korf, E.S., Laurin, D., White, L., & Launer, L.J. (2006). The effect of social engagement on incident dementia: The Honolulu-Asia aging study. American Journal of Epidemiology, 163(5), 433–440.Google Scholar
Sattin, R. (1992). Falls among older persons: A public health perspective. Annual Review of Public Health, 13, 489–508. doi:10.1146/annurev.publhealth.13.1.489 Google Scholar
Sheridan, P.L., Solomont, J., Kowall, N., & Hausdorff, J.M. (2003). Influence of exectuive function on locomotor function: Divided attention increases gait variability in Alzheimer’s disease. Journal of the American Geriatrics Society, 51(11), 1633–1637. doi:10.1046/j.1532-5415.2003.51516.x Google Scholar
Springer, S., Giladi, N., Peretz, C., Yogev, G., Simon, E., & Hausdorff, J.M. (2006). Dual-tasking effects on gait variability: The role of aging, falls, and executive function. Movement Disorders, 21(7), 950–957. doi:10.1002/mds.20848 Google Scholar
Srivastava, S., John, O.P., Gosling, S.D., & Potter, J. (2003). Development of personality in early and middle adulthood: Set like plaster or persistent change? Journal of Personality and Social Psychology, 84(5), 1041–1053. doi:10.1037/0022-3514.84.5.1041 Google Scholar
Tinetti, M., Speechley, M., & Ginter, S. (1988). Risk factors for falls among elderly persons living in the community. New England Journal of Medicine, 319, 1701–1707. doi:10.1056/nejm198812293192604 Google Scholar
Tolea, M., Costa, P.T., Terracciano, A., Griswold, M., Simonsick, E.M., Najjar, S.S., & Ferrucci, L. (2010). Sex-specific correlates of walking speed in a wide age-ranged population. Journals of Gerontology. Series B, Psychological Sciences and Social Sciences, 65(2), 174–184. doi:10.1093/geronb/gbp130 CrossRefGoogle Scholar
van Bemmel, T., Vandenbroucke, J.P., Westendopr, R.G., & Gussekloo, J. (2005). In an observational study elderly patients had an increased risk of falling due to home hazards. Journal of Clinical Epidemiology, 58(1), 63–67. doi:10.1016/j.jclinepi.2004.06.007 Google Scholar
Verghese, J., Buschke, H., Viola, L.C., Katz, M.J., Hall, C., Kuslansky, G., & Lipton, R.B. (2002). Validity of divided attention tasks in predicting falls in older individuals- preliminary study. Journal of the American Geriatric Society, 50(9), 1752–1756. doi:10.1046/j.1532-5415.2002.50415.x Google Scholar
Verghese, J., Holtzer, R., Lipton, R.B., & Wang, C. (2009). Quantitative gait makers and incident fall risk in older adults. The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences, 64(8), 896–901. doi:10.1093/gerona/glp033 Google Scholar
Verghese, J., Holtzer, R., Lipton, R.B., & Wang, C. (2012). Mobility stress test approach to predicting frailty, disability, and mortality in high-functioning older adults. Journal of the American Geriatrics Society, 60(10), 1901–1905. doi:10.1111/j.1532-5415.2012.04145 Google Scholar
Verghese, J., LeValley, A., Hall, C.B., Katz, M.J., Ambrose, A.F., & Lipton, R.B. (2006). Epidemiology of gait disorders in community-residing older adults. Journal of the American Geriatrics Society, 54(2), 255–261. doi:10.1111/j.1532-5415.2005.00580.x Google Scholar
Verghese, J., Wang, C., & Holtzer, R. (2011). Relationship of clinic-based gait speed measurement to limitations in community-based activties in older adults. Archives of Physical Medicine and Rehabilitation, 92(5), 844–846. doi:10.1016/j.apmr.2010.12.030 Google Scholar
Verghese, J., Wang, C., Lipton, R.B., Holtzer, R., & Xue, X. (2007). Quantitative gait dysfunction and risk of cognitive decline and dementia. Journal of Neurology, Neurosurgery, and Psychiatry, 78(9), 929–935. doi:10.1136/jnnp.2006.106914 Google Scholar
Verhaeghen, P., Steitz, D.W., Sliwinski, M.J., & Cerella, J. (2003). Aging and dual-task performance: A meta-analysis. Psychology and Aging, 18(3), 443–460.Google Scholar
Wetherell, J., Reynolds, C., Gatz, M., & Pedersen, N. (2002). Anxiety, cognitive performance, and cognitive decline in normal aging. The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences, 57(3), 246–255. doi:10.1093/geronb/57.3.p246 Google Scholar
Wilk, C., Gold, J., Bartko, J., Dickerson, F., Fenton, W.S., Knable, M., & Buchanan, R.W. (2002). Test-retest stability of the repeatable battery for the assessment of neuropsychological status in schizophrenia. American Journal of Psychiatry, 159(5), 838–844. doi:10.1176/appi.ajp.159.5.838 Google Scholar
Wilson, R.S., Arnold, S.E., Schneider, J.A., Li, Y., & Bennett, D.A. (2007). Chronic distress, age-related neuropathology, and cognitive impairment in old age. Psychosomatics Medicine, 69(4), 7–53. doi:10.1097/01.psy.0000250264.25017.21 Google Scholar
Wilson, R.S., Begeny, C.T., Boyle, P.A., Schneider, J.A., & Bennett, D.A. (2011). Vulnerability to stress, anxiety, and development of dementia in old age. The American Journal of Geriatric Psychiatry, 19(4), 327–334. doi:10.1097/JGP.0b013e31820119da Google Scholar
Wilson, R.S., Krueger, K.R., Gu, L., Bienias, J.L., Mendes de Leon, C.F., & Evans, D.A. (2005). Neuroticism, extraversion, and mortality in a denied population of older persons. Psychosomatic Medication, 67(6), 841–845. doi:10.1097/01.psy.0000190615.20656.83 Google Scholar
Woollacott, M., & Shumway-Cook, A. (2002). Attention and the control of posture and gait: A review of an emerging area of research. Gait and Posture, 16(1), 1–14. doi:10.1016/s0966-6362(01)00156-4 Google Scholar
Yesavage, J.A., Brink, T.L., Rose, T.L., Lum, O., Huang, V., Adey, M., & Leirer, V.O. (1983). Development and validation of a geriatric depression screening scale: A preliminary report. Journal of Psychiatric Research, 17(1), 37–49. doi:10.1016/0022-3956(82)90033-4 Google Scholar
Yogev, G., Giladi, N., Peretz, C., Springer, S., Simon, E., & Hausdorff, J. (2005). Dual tasking, gait rhythmicity, and Parkinson’s disease: Which aspects of gait are attention demanding? European Journal of Neuroscience, 22(5), 1248–1256. doi:10.1111/j.1460-9568.2005.04298.x Google Scholar
Zunzunegui, M.V., Alvarado, B.E., Del Ser, T., & Otero, A. (2003). Social networks, social integration, and social engagement determine cognitive decline in community-dwelling Spanish older adults. The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences, 58(2), 93–100. doi:10.1093/geronb/58.2.s93 Google Scholar