1McDonald WM, Richard IH, DeLong MR. Prevalence, etiology, and treatment of depression in Parkinson’s disease. Biol Psychiatry 2003;54:363-75.
2Rabinstein AA, Shulman LM. Management of behavioral and psychiatric problems in Parkinson’s disease. Parkinsonism Relat Disord 2000;7:41-50.
3Poewe W, Wenning G. The differential diagnosis of Parkinson’s disease. Eur J Neurol 2002;9:23-30.
4Dujardin K, Defebvre L. Apathy in Parkinson diseaseWhat are the underlying mechanisms? Neurology 2012;79:1082-83.
5Aarsland D, Marsh L, Schrag A. Neuropsychiatric symptoms in Parkinson’s disease. Mov Disord 2009;24:2175-86.
6Dujardin K, Sockeel P, Devos D, et al. Characteristics of apathy in Parkinson’s disease. Mov Disord 2007;22:778-84.
7Kirsch-Darrow L, Marsiske M, Okun MS, Bauer R, Bowers D. Apathy and depression: separate factors in Parkinson’s disease. J Int Neuropsychol Soc 2011;17:1058-66.
8Sockeel P, Dujardin K, Devos D, Deneve C, Destee A, Defebvre L. The Lille apathy rating scale: a new instrument for detecting and quanrifying apathy: validation in Parkinson’s disease. J Neurol Neurosurg Psychiatry 2006;77:579-84.
9Hoehn MM, Yahr MD. Parkinsonism: Onset, progression and mortality. Neurology 1967;17:427-42.
10Lang AET, Fahn S. Assessment of Parkinson’s disease. In MunsatTLed. Quantification of Neurologic Deficit. Stoneham: Butterworths, 1989.
11Starkstein SE, Mayberg HS, Preziosi TJ, Andrezejewski P, Leiguarda R, Robinson RG. Reliability, validity, and clinical correlates of apathy in Parkinson’s disease. J Neuropsychiatry Clin Neurosci 1992 Spring;4:134-9.
12Marin RS. Apathy: a neuropsychiatric syndrome. Journal of Neuropsychiatry and Clinical Neuroscience 1991;3:243-54.
13Chaudhuri KR, Martinez_Martin P, Schapira AHV, et al. International multicentre pilot study of the first comprehensive self-completed non motor symptoms questionnaire for Parkinson’s disease: The NMSQuest study. Mov Disorders. 2006;21:916-23.
14Yesavage JA, Brink TL, Rose TL, et al. Development and validation of a geriatric depression screening scale:a preliminary report. J Psychiatr Res 1982-1983;17:37-49.
15Dr. Turan Ertan. Geriatrik Depresyon Ölçeği ile Kendini Değerlendirme Depresyon Ölçeği’nin 60 yaş üzeri Türk populasyonunda geçerlilik ve güvenilirliği. Uzmanlık Tezi İ.Ü. Cerrahpaşa Tıp Fakültesi Psikiyatri Anabilim dalı İstanbul 1996.
16Güngen C, Ertan T, Eker E, Yaşar R, Engin F. Standardize Mini Mental Test’in Türk Toplumunda Hafif Demans Tanısında Geçerlilik ve Güvenilirliği. Türk Psikiyatri Dergisi 2002;13:273-81.
17Chaudhuri KR, Healy DG, Schapira AH. Non-motor symptoms of Parkinson’s disease: diagnosis and management.; National Institute for Clinical Excellence. Lancet Neurol 2006;5:235-45.
18Kirsch-Darrow L, Fernandez HH, Marsiske M, Okun MS, Bowers D. Dissociating apathy and depression in Parkinson disease. Neurology 2006;67:33-8.
19Pedersen KF, Larsen JP, Alves G, Aarsland D. Prevalence and clinical correlates of apathy in Parkinson’s disease: a community-based study. Parkinsonism Relat Disord 2009;15:295-9.
20Isella V, Melzi P, Grimaldi M, et al. Clinical, Neuropsychological, and Morphometric Correlates of Apathy in Parkinson’s Disease. Movement Disorders 2002;17:366-71.
21Varanese S, Perfetti B, Ghilardi MF, Di Rocco. A Apathy, but not depression, reflects inefficient cognitive strategies in Parkinson’s disease. PLoS One 2011;6(3):17846.
22Reijnders JS, Scholtissen B, Weber WE, Aalten P, Verhey FR, Leentjens AF. Neuroanatomical Correlates of Apathy in Parkinson’s Disease: A Magnetic Resonance Imaging Study Using Voxel-Based Morphometry. Mov Disord 2010;25:2318-25.
23Marin RS, Firinciogullari S, Biedrzycki RC. The sources of convergence between measures of apathy and depression. J Affect Disord 1993;28:117-24.
24Levy ML, Cummings JL, Fairbanks LA, et al. Apathy is not depression. J Neuropsychiatry Clin Neurosci 1998;10:314-9.
25Crosiers D, Pickut B, Theuns J, et al. Non-motor symptoms in a Flanders-Belgian population of 215 Parkinson’s disease patients as assessed by the Non-Motor Symptoms Questionnaire. Am J Neurodegener Dis 2012;1:160-7.
26Moretti R, Torre P, Antonello RM, et al. Apathy: a complex symptom specific to the clinical pattern of presentation of Parkinson’s disease? Am J Alzheimers Dis Other Demen 2012;27:196-201.