The prospective relationships among intrinsic motivation, neurocognition, and psychosocial functioning in schizophrenia

Schizophrenia Bulletin

Volumn 36, Issue 5, 2010, Pages 935-948

  Nakagami, Eri ^a   Hoe, Maanse ^b   Brekke, John S ^a  

^a UNIVERSITY OF SOUTHERN CALIFORNIA   (United States)

^b Keimyung University   (South Korea)

Author keywords

intrinsic motivation; neurocognition; outcome; psychosocial functioning; rehabilitation; schizophrenia

Indexed keywords

ADULT; ARTICLE; COGNITION; COMMUNITY BASED REHABILITATION; DISEASE ASSOCIATION; DYNAMICS; FEMALE; GROWTH CURVE; HUMAN; MAJOR CLINICAL STUDY; MALE; MOTIVATION; OUTCOME ASSESSMENT; PREDICTION; PRIORITY JOURNAL; PSYCHOSOCIAL REHABILITATION; SCHIZOAFFECTIVE PSYCHOSIS; SCHIZOPHRENIA; SCORING SYSTEM; SOCIAL PSYCHOLOGY; SYMPTOM; TIME; TREATMENT OUTCOME; UNITED STATES; URBAN AREA;

COGNITION DISORDERS; COMMUNITY MENTAL HEALTH CENTERS; FOLLOW-UP STUDIES; HUMANS; MOTIVATION; NEUROPSYCHOLOGICAL TESTS; PROSPECTIVE STUDIES; PSYCHOTIC DISORDERS; SCHIZOPHRENIA; SCHIZOPHRENIC PSYCHOLOGY; SOCIAL ADJUSTMENT; STATISTICS AS TOPIC; TREATMENT OUTCOME;

EID: 77955928903     PISSN: 05867614     EISSN: 17451701     Source Type: Journal    
DOI: 10.1093/schbul/sbq043     Document Type: Article

References (137)

1. Green MF, Kern RS, Braff DL, Mintz J. Neurocognitive deficits and functional outcome in schizophrenia: are we measuring the 'right stuff'? Schizophr Bull. 2000;26(1):119-136.
2. Brekke JS, Hoe M, Long J, Green MF. How neurocognition and social cognition influence functional change during community-based psychosocial rehabilitation for individuals with schizophrenia. Schizophr Bull. 2007;33:1247-1256.
3. Green MF, Kern RS, Heaton RK. Longitudinal studies of cognition and functional outcome in schizophrenia: implications for MATRICS. Schizophr Res. 2004;72(1):41-51.
4. Dickerson F, Boronow JJ, Ringel N, Parente F. Social functioning and neurocognitive deficits in outpatients with schizophrenia: a 2-year follow-up. Schizophr Res. 1999; 37(1):13-20.
5. Brekke JS, Hoe M, Green MF. Neurocognitive change, functional change and service intensity during community-based psychosocial rehabilitation for schizophrenia. Psychol Med. 2009;39:1637-1647.
6. Choi J, Medalia A. Cognitive rehabilitation in schizophrenia. CML Psychiatry. 2009;1:25-31.
7. Gard DE, Fisher M, Garrett C, Genevsky A, Vinogradov S. Motivation and its relationship to neurocognition, social cognition, and functional outcome in schizophrenia. Schiz-ophr Res. 2009;115:74-81.
8. Nakagami E, Xie B, Hoe M, Brekke JS. Intrinsic motivation, neurocognition and psychosocial functioning in schizophrenia: testing mediator and moderator effects. Schizophr Res. 2008;105(1-3):95-104.
9. Brekke JS, Kay DD, Kee KS, Green MF. Biosocial pathways to functional outcome in schizophrenia. Schizophr Res. 2005;80:213-225.
10. Green MF. What are the functional consequences of neuro-cognitive deficits in schizophrenia? Am J Psychiatry. 1996;153:321-330.
11. Kern RS, Liberman RP, Becker DR, Drake RE, Sugar CA, Green MF. Errorless learning for training individuals with schizophrenia at a community mental health setting providing work experience. Schizophr Bull. 2009;35:807-815.
12. McGurk SR, Twamley EW, Sitzer DI, McHugo GJ, Mueser KT. A meta-analysis of cognitive remediation in schizophrenia. Am J Psychiatry. 2007;164:1791-1802.
13. Szoke A, Trandafir A, Dupont ME, Meary A, Schurhoff F, Leboyer M. Longitudinal studies of cognition in schizophrenia: meta-analysis. Br J Psychiatry. 2008;192:248-257.
14. Couture SM, Penn DL, Roberts DL. The functional significance of social cognition in schizophrenia: a review. Schiz-ophr Bull. 2006;32(suppl 1):S44-S63.
15. Brekke JS, Long J, Nesbitt N, Sobel E. The impact of service characteristics on functional outcomes from community support programs for persons with schizophrenia: a growth curve analysis. J Consult Clin Psychol. 1997;65:464-475.
16. Brekke JS, Long JD. Community-based psychological rehabilitation and prospective change in functional, clinical, and subjective experience variables in schizophrenia. Schizophr Bull. 2000;26:667-680.
17. Barch DM. The relationships among cognition, motivation, and emotion in schizophrenia: how much and how little we know. Schizophr Bull. 2005;31:875-881.
18. Velligan DI, Kern RS, Gold JM. Cognitive rehabilitation for schizophrenia and the putative role of motivation and expectancies. Schizophr Bull. 2006;32:474-485.
19. Deci EL, Ryan RM. Intrinsic Motivation and Self-Determination in Human Behavior. New York, NY: Plenum; 1985.
20. Ryan RM, Deci EL. Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being. Am Psychol. 2000;55:68-78.
21. Barch DM, Yodkovik N, Sypher-Locke H, Hanewinkel M. Intrinsic motivation in schizophrenia: relationships to cognitive function, depression, anxiety, and personality. J Abnorm Psychol. 2008;117:776-787.
22. Green MF, Nuechterlein KH. The MATRICS initiative: developing a consensus cognitive battery for clinical trials. Schizophr Res. 2004;72(1):1-3.
23. Green MF, Nuechterlein KH, Gold JM, et al. Approaching a consensus cognitive battery for clinical trials in schizophrenia: the NIMH-MATRICS conference to select cognitive domains and test criteria. Biol Psychiatry. 2004;56:301-307.
24. Marder SR, Fenton W. Measurement and treatment research to improve cognition in schizophrenia: NIMH MATRICS initiative to support the development of agents for improving cognition in schizophrenia. Schizophr Res. 2004;72:5019.
25. Adolphs R. The neurobiology of social cognition. Curr Opin Neurobiol. 2001;11:231-239.
26. Boydell KM, Gladstone BM, Volpe T. Interpreting narratives of motivation and schizophrenia: a biopsychosocial understanding. Psychiatr Rehabil J. 2003;26:422-426.
27. Brown RG, Pluck G. Negative symptoms: the 'pathology' of motivation and goal-directed behaviour. Trends Neurosci. 2000;23:412-417.
28. Ernst MP, Paulus M. Neurobiology of decision making: a selective review from a neurocognitive and clinical perspective. Biol Psychiatry. 2005;58:596-604.
29. Grossberg S. Neural models of normal and abnormal behavior: what do schizophrenia, parkinsonism, attention deficit disorder, and depression have in common? Prog Brain Res. 1999;121:375-406.
30. Gard DE, Kring AM, Gard MG, Horan WP, Green MF. Anhedonia in schizophrenia: distinctions between anticipatory and consummatory pleasure. Schizophr Res. 2007;93: 253-260.
31. Gold JM, Waltz JA, Prentince KJ, Morris SF, Heerey EA. Reward processing in schizophrenia: a deficit in the representation of value. Schizophr Bull. 2008;34:835-847.
32. Heerey EA, Gold JM. Patients with schizophrenia demonstrate dissociation between affective experience and motivated behavior. J Abnorm Psychol. 2007;116:268-278.
33. Heerey EA, Robinson BM, McMahon RP, Gold JM. Delay discounting in schizophrenia. Cogn Neuropsychiatry. 2007;12:213-221.
34. Kee K, Green MF, Mintz J, Brekke JS. Is emotion processing a predictor of functional outcome in schizophrenia? Schizophr Bull. 2003;29:487-497.
35. Yamada A, Lee K, Dinh TQ, Barrio C, Brekke JS. Intrinsic motivation as a mediator of relationships between symptoms and functioning among individuals with schizophrenia-spectrum disorders in a diverse urban community. J Nerv Ment Dis. In press.
36. Horan WP, Green MF, Kring AM, Nuechterlein KH. Anhe-donia in schizophrenia: a review of assessment strategies. Schizophr Bull. 2006;32:259-273.
37. Sharma T, Antonova L. Cognitive function in schizophrenia: deficits, functional consequences, and future treatment. Psychiatr Clin North Am. 2003;26(1):25-40.
38. Heggestad ED, Kanfer R. Individual differences in trait motivation: development of the Motivational Trait Questionnaire. Int J Educ Res. 2000;33:751-776.
39. Heider F. The Psychology of Interpersonal Relations. New York, NY: John Wiley & Sons; 1958.
40. Bandura A. Self-efficacy: The exercise of control. New York, NY: Worth Publishers; 1997.
41. Weiner B. An attributional theory of achievement motivation and emotion. Psychol Bull. 1985;92:548-573.
42. Zimmerman BJ. A social cognitive view of self-regulated learning. J Educ Psychol. 1989;82:297-306.
43. Gottfried AE. Academic intrinsic motivation in young elementary school children. J Educ Psychol. 1990;82:525-538.
44. Aunola K, Leskinen E, Nurmi JE. Developmental dynamics between mathematical performance, task motivation, and teachers' goals during the transition to primary school. Br J Educ Psychol. 2006;76:21-40.
45. Patall EA, Cooper H, Robinson JC. The effects of choice on intrinsic motivation and related outcomes: a meta-analysis of research findings. Psychol Bull. 2008;134:270-300.
46. Wigfield A, Harold RD, Freedman-Doan C, et al. Change in children's competence beliefs and subjective task values across the elementary school years: a 3-year study. J Educ Psychol. 1997;89:451-469.
47. Vroom VH. Work and Motivation. New York, NY: Wiley; 1964.
48. Herzberg F, Mausner B, Snyderman BB. The Motivation to Work. New York, NY: Wiley; 1959.
49. Ames C. Classrooms: goals, structures, and student motivation. J Educ Psychol. 1992;84:261-271.
50. Locke E, Latham G. A Theory of Goal Setting and Task Performance. Englewood Cliffs, NJ: Prentice-Hall; 1990.
51. Gottfried AE, Fleming JS, Gottfried AW. Role of parental motivational practices in children's academic intrinsic motivation and achievement. J Educ Psychol. 1994;86:104-113.
52. Viljaranta J, Lerkkanen MK, Poikkeus AM, Aunola K, Nurmi JE. Cross-lagged relations between task motivation and performance in arithmetic and literacy in kindergarten. Learning and Instruction. 2009;19:335-344.
53. Deci EL, Vallerand RJ, Pelletier LG, Ryan RM. Motivation and education: the self-determination perspective. Educ Psy-chol. 1991;26:325-346.
54. Fredricks JA, Eccles JS. Children's competence and value beliefs from childhood through adolescence: growth trajectories in two male-sex-typed domains. Dev Psychol. 2002;38: 519-533.
55. Gottfried AE, Fleming JS, Gottfried AW. Continuity of academic intrinsic motivation from childhood through late adolescence: a longitudinal study. J Educ Psychol. 2001; 93:3-13.
56. Harter S. A new self-report scale of intrinsic versus extrinsic orientation in the classroom: motivational and informational components. Dev Psychol. 1981;17:300-312.
57. Otis N, Grouzet FME, Pelletier LG. Latent motivational change in an academic setting: a 3-year longitudinal study. J Educ Psychol. 2005;97(2):170-183.
58. Young A, Sullivan G, Murata D, Sturm D, Koegel P. Implementing publicly funded risk contracts with community mental health organizations. Psychiatr Serv. 1998; 49:1579-1584.
59. Lezak MD. Neuropsychological Assessment. New York, NY: Oxford University Press; 1995.
60. Oltmanns TF, Neale JM. Schizophrenic performance when distractors are present: attentional deficit or differential task difficulty? J Abnorm Psychol. 1975;84:205-209.
61. Delis DC, Kramer JH, Kaplan E, Ober BA. The California Verbal Learning Test. New York, NY: Psychological Corporation; 1987.
62. Nuechterlein LK, Asarnow RF. UCLA Continuous Performance Test [manual and computer program]. Los Angeles, CA. 1992;4.
63. Heaton RK. A Manual for the Wisconsin Card Sorting Task. Odessa, FL: Psychological Assessment Resources; 1981.
64. Murphy H, Roopchand N. Intrinsic motivation and self-esteem in traditional and mature students at a post-1992 university in the north-east of England. Educ Stud. 2003; 29:243-259.
65. Heinrichs DW, Hanlon TE, Carpenter WT. The Quality of Life Scale: an instrument for rating the schizophrenic deficit syndrome. Schizophr Bull. 1984;10:388-398.
66. Amabile TM, Hill KG, Hennessey BA, Tighe EM. The Work Preference Inventory: assessing intrinsic and extrinsic motivational orientations. J Pers Soc Psychol. 1994;66: 950-967.
67. Ryan RM. Control and information in the interpersonal sphere: an extension of cognitive evaluation theory. J Pers Soc Psychol. 1982;43:450-461.
68. Pelletier LG, Fortier MS, Vallerand RJ, Tuson KM, Briere NM, Blais MR. Toward a new measure of intrinsic motivation, extrinsic motivation, and amotivation in sports: the sport motivation scale (SMS). J Sport Exerc Psychol. 1995;17:35-53.
69. Vallerand RJ, Pelletier LG, Blais MR, Briere NM, Senecal C, Vallieres EF. Academic Motivation Scale: a measure of intrinsic, extrinsic, and amotivation in education. Educ Psychol Meas. 1992;52:1003-1017.
70. Blanchard JJ, Cohen AS. The structure of negative symptoms within schizophrenia: implications for assessment. Schizophr Bull. 2006;32:238-245.
71. Kirkpatrick B, Wayne S, Fenton WS, Carpenter WT, Marder SR. The NIMH-MATRICS consensus statement on negative symptoms. Schizophr Bull. 2006;32:214-219.
72. Lukoff D, Nuechterlein K, Ventura J. Manual for the expanded Brief Psychiatric Rating Scale. Schizophr Bull. 1986;12:594-602.
73. Test MA, Knoedler WH, Allness DJ, Burke SS, Brown RL, Wallisch LS. Long-term community care through an assertive continuous treatment team. In: Tamminga CA, Schulz SC, eds. Advances in Neuropsychiatry and Psychopharmacol-ogy. Schizophrenia Research. Vol 1. New York, NY: Raven Press; 1991:239-246.
74. Brekke JS, Levin S, Wolkon GH, Sobel E, Slade ES. Psycho-social functioning and subjective experience in schizophrenia. Schizophr Bull. 1993;19:599-608.
75. Goodman SH, Sewell DR, Cooley EL, Leavitt N. Assessing levels of adaptive functioning: the Role Functioning Scale. Community Ment Health J. 1993;29:119-131.
76. McPheeters HL. Statewide mental health outcome evaluation: a perspective of two southern states. Community Ment Health J. 1984;20:44-55.
77. Green MF, Gracely EJ. Selecting a rating scale for evaluating services to the chronically mentally ill. Community Ment Health J. 1987;23:91-102.
78. Hedlund JL, Vidweg BW. The Brief Psychiatric Rating Scale (BPRS): a comprehensive review. J Oper Psychiatry. 1980;11:49-65.
79. Newcomer JW, Faustman WO, Yeh W, Csernansky JG. Distinguishing depression and negative symptoms in unme-dication patients with schizophrenia. Psychiatry Res. 1990;31:243-250.
80. Rhoades HM,OverallJE.ThesemistructuredBPRS interview and rating guide. Psychopharmacol Bull. 1988;24(1):101-104.
81. Thiemann S, Csermamslu JG, Berger PA. Rating scales in research: the case of negative symptoms. Psychiatry Res. 1987;20:47-55.
82. Long JD, Brekke JS. Longitudinal factor structure of the Brief Psychiatric Rating Scale in schizophrenia. Psychol Assess. 1999;11:498-506.
83. Ventura J, Green MF, Shaner A, Liberman RP. Training and quality assurance with the Brief Psychiatric Rating Scale: the drift busters. Int J Methods Psychiatr Res. 1995;3:221-244.
84. Bentler PM. EQS: Structural Equations Program Model. Los Angeles, CA: Multivariate Software Inc.; 1995.
85. Kline RB. Principles and Practice of Structural Equation Modeling. 2nd ed. New York, NY: Guildford Press; 2005.
86. Loehlin JC. Latent Variable Models: An Introduction to Factor, Path, and Structural Analysis. 2nd ed. Hillsdale, NJ: Lawrence Erlbaum Associates; 1992.
87. McArdle JJ. Latent variable growth within behavior genetic models. Behav Genet. 1986;16:163-200.
88. McArdle JJ, Epstein D. Latent growth curves within developmental structural equation models. Child Dev. 1987; 58:110-133.
89. Meredith W, Tisak J. Latent curve analysis. Psychometrika. 1990;55:107-122.
90. Rogosa DR, Willett JB. Understanding correlates of change by modeling individual differences in growth. Psychometrika. 1985;50:203-228.
91. McArdle JJ. A latent difference score approach to longitudinal dynamic structural analysis. In: Cudeck R, du Toit S, Sörbom D, eds. Structural Equation Modeling: Present and future. A Festschrift in honor of Karl Jöreskog. Lincolnwood, IL: Scientific Software International; 2001:341-380.
92. McArdle JJ, Hamagami F. Latent difference score structural models for linear dynamic analyses with incomplete longitudinal data. In: Collins L, Sayer A, eds. New Methods for the Analysis of Change. Washington, DC: American Psychological Association; 2001:139-175.
93. Kurtz MM, Moberg PJ, Ragland JD, Gur RC, Gur RE. Symptoms versus neurocognitive test performance as predictors of psychosocial status in schizophrenia: a 1-and 4-year prospective study. Schizophr Bull. 2005;31(1):167-174.
94. Milev P, Ho BC, Arndt S, Andreasen NC. Predictive values of neurocognition and negative symptoms in functional outcome in schizophrenia: a longitudinal first-episode study with 7-year follow-up. Am J Psychiatry. 2005;162: 495-506.
95. Wittorf A, Wiedemann G, Buchkremer G, Klingberg S. Prediction of community outcome in schizophrenia 1 year after discharge from impatient treatment. Eur Arch Psychiatry Clin Neurosci. 2008;258(1):48-58.
96. Bollen KA, Curran PJ. Latent Curve Models: A Structural Equation Perspective. Hoboken, NJ: Wiley; 2006.
97. Curran PJ, Hussong AM. The use of latent trajectory models in psychopathology research. J Abnorm Psychol. 2003; 112:526-544.
98. Finkel SE. Causal Analysis with Panel Data. Thousand Oaks, CA: Sage; 1995.
99. Bentler PM. Comparative fit indexes in structural models. Psychol Bull. 1990;107:238-246.
100. Browne MW, Cudeck R. Alternative ways of assessing model fit. In: Bollen KA, Long GS, eds. Testing Structural Equation Models. Newbury Park, CA: Sage; 1993:136-162.
101. Kelloway EK. Using LISREL for Structural Equation Modeling. Thousands Oaks, CA: Sage; 1988.
102. Pedhazur EJ. Multiple Regression in Behavioral Research: Explanation and Prediction. 3rd ed. New York, NY: Harcourt Brace; 1997.
103. Gottfried AE, Marcoulides GA, Gottfried AW, Oliver P, Guerin D. Modeling the developmental decline in academic intrinsic math motivation: childhood through adolescence. Int J Behav Dev. 2007;31:317-327.
104. Lepper MR, Corpus JH, Iyengar SS. Intrinsic and extrinsic motivational orientations in the classroom: age differences and academic correlates. J Educ Psychol. 2005; 97:184-196.
105. Martin AJ. Examining a multidimensional model of student motivation and engagement using a construct validation approach. Br J Educ Psychol. 2007;77:413-440.
106. Spinath B, Spinath FM. Longitudinal analysis of the link between learning motivation and competence beliefs among elementary school children. Learn Instr. 2005;15:87-102.
107. Turner JC, Patrick H. How does motivation develop and how does it change? Reframing motivation research. Educ Psychol. 2008;43:119-131.
108. Medalia A, Revheim N, Casey M. Remediation of problem-solving skills in schizophrenia: evidence of a persistent effect. Schizophr Res. 2002;57(2-3):165-171.
109. Medalia A, Richardson R. What predicts a good response to cognitive remediation interventions? Schizophr Bull. 2005;31:942-953.
110. Brenner H, Roder V, Hodel B, Kienzie N, Reed D, Liberman R. Integrated Psychological Therapy for Schizophrenic Patients. Seattle, WA: Hogrefe & Huber; 1994.
111. Hogarty GE, Flesher S, Ulrich R, et al. Cognitive enhancement therapy for schizophrenia: effects of a 2-year randomized trial on cognition and behavior. Arch Gen Psychiatry. 2004;61:866-876.
112. Wexler BE, Bell MD. Cognitive remediation and vocational rehabilitation for schizophrenia. Schizophr Bull. 2005;31:931-941.
113. Wykes T, Reeder C. Cognitive Remediation Therapy for Schizophrenia: an Introduction. New York, NY: Brunner-Routledge; 2005.
114. Choi J, Medalia A. Intrinsic motivation and learning in a schizophrenia spectrum sample. Schizophr Res. 2009; 118:12-19.
115. Bustillo JR, Lauriello J, Horan WP, Keith SJ. The psycho-social treatment of schizophrenia: an update. Am J Psychiatry. 2002;158:163-175.
116. Dixon LB, Dickerson F, Bellack AS, et al. The 2009 schizophrenia PORT psychosocial treatment recommendations and summary statements. Schizophr Bull. 2010;36(1): 48-70.
117. Bellack AS, Mueser KT, Morrison RL, Tierney A, Podell K. Remediation of cognitive deficits in schizophrenia. Am J Psychiatry. 1990;147:1650-1655.
118. Green MF, Satz P, Ganzell S, Vaclav JF. Wisconsin Card Sorting Test performance in schizophrenia: remediation of a stubborn deficit. Am J Psychiatry. 1992;149:62-67.
119. Hellman SG, Kern RS, Neilson LM, Green MF. Monetary reinforcement and Wisconsin Card Sorting performance in schizophrenia: why show me the money? Schizophr Res. 1998;34:67-75.
120. Kern RS, Green MF, Goldstein MJ. Modification of performance on the span of apprehension, a putative marker of vulnerability to schizophrenia. J Abnorm Psychol. 1995;104:385-389.
121. Grant PM, Beck AT. Defeatist beliefs as a mediator of cognitive impairment, negative symptoms, and functioning in schizophrenia. Schizophr Bull. 2009;35: 798-806.
122. Rector NA, Beck AT, Stolar NM. The negative symptoms of schizophrenia: a cognitive perspective. Can J Psychiatry. 2005;50:247-257.
123. Vallerand RJ. Toward a hierarchical model of intrinsic and extrinsic motivation. In: Zanna M, ed. Advances in Experimental Social Psychology. New York, NY: Academic Press; 1997:271-360.
124. Deci EL, Connell JP, Ryan RM. Self-determination in a work organization. J Appl Psychol. 1989;74:580-590.
125. Ryan RM, Niemic CP. Self-determination theory in schools of education. Theor Res Educ. 2009;7:263-272.
126. Eccles JS, Wigfield A. Motivational beliefs, values, and goals. Annu Rev Psychol. 2002;53:109-132.
127. Anthony WA, Liberman RP. The practice of psychiatric rehabilitation: historical, conceptual, and research base. Schiz-ophr Bull. 1986;12:542-559.
128. Arnsten SM. Intrinsic motivation. Am J Occup Ther. 1990;44:462-463.
129. Burke JP. A clinical perspective on motivation: pawn versus origin. Am J Occup Ther. 1977;31:254-258.
130. Florey LL. Intrinsic motivation: the dynamics of occupational therapy theory. Am J Occup Ther. 1969;23: 319-322.
131. Wu C, Hwang MT. Evaluating motivational deficits in individuals with mental illness: the Chinese General Causality Orientations Scale. Occup Ther Int. 2006;7(1):57-77.
132. Doble S. Intrinsic motivation and clinical practice: the key to understanding the unmotivated client. Can J Occup Ther. 1988;55:75-81.
133. Kielhofner G, Burke J. A model of human occupation, part one. Conceptual framework and content. Am J Occup Ther. 1980;34:572-581.
134. Cordova DI, Lepper MR. Intrinsic motivation and the process of learning: beneficial effects of contextualization, personalization, and choice. J Educ Psychol. 1993;88:715-730.
135. Choi J, Mogami T, Medalia A. Intrinsic Motivation Inventory (IMI): an adapted scale for schizophrenia research. Schizophr Bull. September 21, 2009; doi: 10.1093/schbul/sbp030.
136. Granger CWJ. Investigating causal relations by econometric models and cross-spectral methods. Econometrica. 1969;37:424-438.
137. Bozikas VP, Kosmidis MH, Anezoulaki D, Giannakou M, Andreou C, Karavatos A. Impaired perception of affective prosody in schizophrenia. J Neuropsychiatry Clin Neurosci. 2006;18:81-85.