| 1. | Affective Disorders, Psychotic (26 recruiting studies) |
| 2. | Agoraphobia (2 recruiting studies) |
| 3. | AIDS Dementia Complex (2 recruiting studies) |
| 4. | Alcohol Drinking (2 recruiting studies) |
| 5. | Alcohol-Related Disorders (25 recruiting studies) |
| 6. | Alcoholism (28 recruiting studies) |
| 7. | Alzheimer Disease (46 recruiting studies) |
| 8. | Amnesia (4 recruiting studies) |
| 9. | Amphetamine-Related Disorders (2 recruiting studies) |
| 10. | Anorexia (6 recruiting studies) |
| 11. | Anorexia Nervosa (3 recruiting studies) |
| 12. | Antisocial Personality Disorder (1 recruiting study) |
| 13. | Anxiety Disorders (61 recruiting studies) |
| 14. | Anxiety, Separation (1 recruiting study) |
| 15. | Asperger Syndrome (2 recruiting studies) |
| 16. | Attention Deficit and Disruptive Behavior Disorders (11 recruiting studies) |
| 17. | Attention Deficit Disorder with Hyperactivity (10 recruiting studies) |
| 18. | Auditory Perceptual Disorders (1 recruiting study) |
| 19. | Autistic Disorder (14 recruiting studies) |
| 20. | Behavior (143 recruiting studies) |
| 21. | Behavior and Behavior Mechanisms (105 recruiting studies) |
| 22. | Behavior, Addictive (3 recruiting studies) |
| 23. | Behavioral Symptoms (72 recruiting studies) |
| 24. | Bipolar Disorder (35 recruiting studies) |
| 25. | Borderline Personality Disorder (3 recruiting studies) |
| 26. | Bulimia (2 recruiting studies) |
| 27. | Cataplexy (4 recruiting studies) |
| 28. | Child Development Disorders, Pervasive (13 recruiting studies) |
| 29. | Cocaine-Related Disorders (7 recruiting studies) |
| 30. | Cognition Disorders (64 recruiting studies) |
| 31. | Communication Disorders (14 recruiting studies) |
| 32. | Compulsive Behavior (2 recruiting studies) |
| 33. | Conduct Disorder (3 recruiting studies) |
| 34. | Cyclothymic Disorder (1 recruiting study) |
| 35. | Delirium (63 recruiting studies) |
| 36. | Delusions (3 recruiting studies) |
| 37. | Dementia (68 recruiting studies) |
| 38. | Depression (129 recruiting studies) |
| 39. | Depression, Involutional (25 recruiting studies) |
| 40. | Depression, Postpartum (7 recruiting studies) |
| 41. | Depressive Disorder (128 recruiting studies) |
| 42. | Developmental Disabilities (14 recruiting studies) |
| 43. | Disorders of Excessive Somnolence (4 recruiting studies) |
| 44. | Drinking Behavior (2 recruiting studies) |
| 45. | Dyslexia (4 recruiting studies) |
| 46. | Dyslexia, Acquired (1 recruiting study) |
| 47. | Dyssomnias (19 recruiting studies) |
| 48. | Dysthymic Disorder (3 recruiting studies) |
| 49. | Eating Disorders (10 recruiting studies) |
| 50. | Elimination Disorders (1 recruiting study) |
| 51. | Encopresis (1 recruiting study) |
| 52. | Gambling (4 recruiting studies) |
| 53. | Habits (12 recruiting studies) |
| 54. | Heroin Dependence (1 recruiting study) |
| 55. | Impotence (1 recruiting study) |
| 56. | Impulse Control Disorders (6 recruiting studies) |
| 57. | Learning Disorders (3 recruiting studies) |
| 58. | Marijuana Abuse (2 recruiting studies) |
| 59. | Mental Disorders (398 recruiting studies) |
| 60. | Mental Disorders Diagnosed in Childhood (45 recruiting studies) |
| 61. | Mental Retardation (14 recruiting studies) |
| 62. | Mood Disorders (87 recruiting studies) |
| 63. | Mutism (1 recruiting study) |
| 64. | Narcolepsy (3 recruiting studies) |
| 65. | Obsessive-Compulsive Disorder (13 recruiting studies) |
| 66. | Opioid-Related Disorders (7 recruiting studies) |
| 67. | Panic Disorder (9 recruiting studies) |
| 68. | Paranoid Behavior (1 recruiting study) |
| 69. | Paranoid Disorders (3 recruiting studies) |
| 70. | Parasomnias (2 recruiting studies) |
| 71. | Personality Disorders (4 recruiting studies) |
| 72. | Phobic Disorders (5 recruiting studies) |
| 73. | Pick Disease of the Brain (4 recruiting studies) |
| 74. | Psychological Phenomena and Processes (25 recruiting studies) |
| 75. | Psychophysiology (28 recruiting studies) |
| 76. | Psychotic Disorders (94 recruiting studies) |
| 77. | Quality of Life (31 recruiting studies) |
| 78. | Restless Legs Syndrome (3 recruiting studies) |
| 79. | Schizophrenia (71 recruiting studies) |
| 80. | Schizophrenia and Disorders with Psychotic Features (68 recruiting studies) |
| 81. | Schizophrenia, Childhood (1 recruiting study) |
| 82. | Seasonal Affective Disorder (2 recruiting studies) |
| 83. | Self-Injurious Behavior (2 recruiting studies) |
| 84. | Sexual and Gender Disorders (1 recruiting study) |
| 85. | Sexual Dysfunctions, Psychological (1 recruiting study) |
| 86. | Sleep Deprivation (4 recruiting studies) |
| 87. | Sleep Disorders (21 recruiting studies) |
| 88. | Sleep Disorders, Circadian Rhythm (2 recruiting studies) |
| 89. | Sleep Disorders, Intrinsic (19 recruiting studies) |
| 90. | Sleep Initiation and Maintenance Disorders (5 recruiting studies) |
| 91. | Smoking (17 recruiting studies) |
| 92. | Somatoform Disorders (1 recruiting study) |
| 93. | Stereotypic Movement Disorder (1 recruiting study) |
| 94. | Stress Disorders, Post-Traumatic (18 recruiting studies) |
| 95. | Stress Disorders, Traumatic (18 recruiting studies) |
| 96. | Stress Disorders, Traumatic, Acute (1 recruiting study) |
| 97. | Substance Abuse, Intravenous (2 recruiting studies) |
| 98. | Substance-Related Disorders (61 recruiting studies) |
| 99. | Suicide (4 recruiting studies) |
| 100. | Suicide, Attempted (2 recruiting studies) |
| 101. | Tic Disorders (12 recruiting studies) |
| 102. | Tobacco Use Disorder (9 recruiting studies) |
| 103. | Tourette Syndrome (11 recruiting studies) |
| 104. | Trichotillomania (2 recruiting studies) |
