| 1. | Affective Disorders, Psychotic (59 studies) |
| 2. | Agoraphobia (3 studies) |
| 3. | AIDS Dementia Complex (12 studies) |
| 4. | Alcohol Drinking (3 studies) |
| 5. | Alcohol-Related Disorders (51 studies) |
| 6. | Alcoholism (49 studies) |
| 7. | Alzheimer Disease (87 studies) |
| 8. | Amnesia (8 studies) |
| 9. | Amphetamine-Related Disorders (9 studies) |
| 10. | Anorexia (13 studies) |
| 11. | Anorexia Nervosa (3 studies) |
| 12. | Antisocial Personality Disorder (2 studies) |
| 13. | Anxiety Disorders (95 studies) |
| 14. | Anxiety, Separation (3 studies) |
| 15. | Asperger Syndrome (2 studies) |
| 16. | Attention Deficit and Disruptive Behavior Disorders (25 studies) |
| 17. | Attention Deficit Disorder with Hyperactivity (22 studies) |
| 18. | Auditory Perceptual Disorders (1 study) |
| 19. | Autistic Disorder (19 studies) |
| 20. | Behavior (269 studies) |
| 21. | Behavior and Behavior Mechanisms (185 studies) |
| 22. | Behavior, Addictive (3 studies) |
| 23. | Behavioral Symptoms (134 studies) |
| 24. | Bipolar Disorder (68 studies) |
| 25. | Borderline Personality Disorder (3 studies) |
| 26. | Bulimia (5 studies) |
| 27. | Cataplexy (5 studies) |
| 28. | Child Behavior Disorders (1 study) |
| 29. | Child Development Disorders, Pervasive (18 studies) |
| 30. | Cocaine-Related Disorders (104 studies) |
| 31. | Cognition Disorders (129 studies) |
| 32. | Communication Disorders (18 studies) |
| 33. | Compulsive Behavior (2 studies) |
| 34. | Conduct Disorder (4 studies) |
| 35. | Consciousness Disorders (6 studies) |
| 36. | Cyclothymic Disorder (1 study) |
| 37. | Delirium (128 studies) |
| 38. | Delusions (4 studies) |
| 39. | Dementia (138 studies) |
| 40. | Dementia, Vascular (2 studies) |
| 41. | Depersonalization (1 study) |
| 42. | Depression (244 studies) |
| 43. | Depression, Involutional (56 studies) |
| 44. | Depression, Postpartum (7 studies) |
| 45. | Depressive Disorder (241 studies) |
| 46. | Developmental Disabilities (21 studies) |
| 47. | Disorders of Excessive Somnolence (6 studies) |
| 48. | Drinking Behavior (2 studies) |
| 49. | Dyslexia (5 studies) |
| 50. | Dyslexia, Acquired (1 study) |
| 51. | Dyssomnias (51 studies) |
| 52. | Dysthymic Disorder (3 studies) |
| 53. | Eating Disorders (24 studies) |
| 54. | Elimination Disorders (1 study) |
| 55. | Encopresis (1 study) |
| 56. | Gambling (4 studies) |
| 57. | Habits (22 studies) |
| 58. | Heroin Dependence (16 studies) |
| 59. | Impotence (2 studies) |
| 60. | Impulse Control Disorders (7 studies) |
| 61. | Learning Disorders (4 studies) |
| 62. | Marijuana Abuse (2 studies) |
| 63. | Mental Disorders (943 studies) |
| 64. | Mental Disorders Diagnosed in Childhood (79 studies) |
| 65. | Mental Retardation (34 studies) |
| 66. | Mood Disorders (172 studies) |
| 67. | Morphine Dependence (2 studies) |
| 68. | Mutism (1 study) |
| 69. | Narcolepsy (5 studies) |
| 70. | Obsessive-Compulsive Disorder (22 studies) |
| 71. | Opioid-Related Disorders (102 studies) |
| 72. | Panic Disorder (15 studies) |
| 73. | Paranoid Behavior (1 study) |
| 74. | Paranoid Disorders (3 studies) |
| 75. | Parasomnias (2 studies) |
| 76. | Passive-Aggressive Personality Disorder (1 study) |
| 77. | Personality Disorders (7 studies) |
| 78. | Phobic Disorders (9 studies) |
| 79. | Pick Disease of the Brain (6 studies) |
| 80. | Psychological Phenomena and Processes (71 studies) |
| 81. | Psychophysiology (78 studies) |
| 82. | Psychotic Disorders (163 studies) |
| 83. | Quality of Life (194 studies) |
| 84. | Restless Legs Syndrome (3 studies) |
| 85. | Schizophrenia (104 studies) |
| 86. | Schizophrenia and Disorders with Psychotic Features (99 studies) |
| 87. | Schizophrenia, Childhood (1 study) |
| 88. | Seasonal Affective Disorder (7 studies) |
| 89. | Self-Injurious Behavior (4 studies) |
| 90. | Sexual and Gender Disorders (3 studies) |
| 91. | Sexual Dysfunctions, Psychological (3 studies) |
| 92. | Sleep Deprivation (4 studies) |
| 93. | Sleep Disorders (58 studies) |
| 94. | Sleep Disorders, Circadian Rhythm (2 studies) |
| 95. | Sleep Disorders, Intrinsic (50 studies) |
| 96. | Sleep Initiation and Maintenance Disorders (9 studies) |
| 97. | Smoking (34 studies) |
| 98. | Somatoform Disorders (2 studies) |
| 99. | Stereotypic Movement Disorder (2 studies) |
| 100. | Stress Disorders, Post-Traumatic (29 studies) |
| 101. | Stress Disorders, Traumatic (29 studies) |
| 102. | Stress Disorders, Traumatic, Acute (2 studies) |
| 103. | Substance Abuse, Intravenous (4 studies) |
| 104. | Substance Withdrawal Syndrome (5 studies) |
| 105. | Substance-Related Disorders (303 studies) |
| 106. | Suicide (8 studies) |
| 107. | Suicide, Attempted (3 studies) |
| 108. | Tic Disorders (21 studies) |
| 109. | Tobacco Use Disorder (22 studies) |
| 110. | Tourette Syndrome (20 studies) |
| 111. | Trichotillomania (3 studies) |
