Broadly defined, a psychologist is an knowledgeable professional with expertise in the study of human thoughts, emotions, and behavior. Practically interpolation, most psychologists are experts with degrees in a particular subfield, such as social psychology or clinical psychology.

Types of Psychology
Clinical psychology
Counseling psychology
Social psychology
Cognitive psychology
Industrial and organizational (I-O) psychology
Developmental psychology
School psychology

The various courses offered by the Department of Psychology at UC San Diego are as follows:
Lower Division Classes

1. Psychology (4)

2. General Psychology: Biological Foundations (4)

3. General Psychology: Cognitive Foundations (4)

4. General Psychology: Behavioral Foundations (4)

6. General Psychology: Social Foundations (4)

7. General Psychology: Developmental Foundations (4)

60. Introduction to Statistics (4)

70. Research Methods in Psychology (4)

87. Freshmen Seminar (1)

90. Undergraduate Seminar (1)

99. Independent Study (2 or 4)

Upper Division Classes

100. Clinical Psychology (4)

101. Developmental Psychology (4)

102. Sensory Neuroscience (4)

104. Social Psychology (4)

105. Cognitive Psychology (4)

106. Behavioral Neuroscience (4)

108. Cognitive Neuroscience (4)

111A. Research Methods I (6)

111B. Research Methods II (6)

114. Psychophysiological Perspectives on the Social Mind Laboratory (4)

115A. Laboratory in Cognitive Psychology I (4)

115B. Laboratory in Cognitive Psychology II (4)

116. Laboratory in Clinical Psychology Research (4)

117. Laboratory in Educational Research and Outreach (4)

120. Learning and Motivation (4)

121. Laboratory in Operant Psychology (4)

122. Mechanisms of Animal Behavior (4)

123. Cognitive Control and Frontal Lobe Function (4)

124. Clinical Assessment and Treatment (4)

125. Clinical Neuropsychology (4)

128. Psychology of Reading (4)

129. The Logic of Perception (4)

130. Delay of Gratification (4)

132. Hormones and Behavior (4)

133. Circadian Rhythms—Biological Clock (4)

134. Eating Disorders (4)

136. Cognitive Development (4)

137. Social Cognition (4)

138. Sound and Music Perception (4)

139. Social Psychology of Sports (4)

140. Human Behavior Laboratory (4)

141. Evolution and Human Nature (4)

142. Psychology of Consciousness (4)

143. Control and Analysis of Human Behavior (4)

144. Memory and Amnesia (4)

145. Psychology of Language (4)

146. Language & Conceptual Development (4)

147. Gender (4)

148. Psychology of Judgment and Decision (4)

150. Cognitive Neuroscience of Vision (4)

151. Tests and Measurement (4)

152. Conceptions of Intelligence (4)

153. Psychology of Emotion (4)

154. Behavior Modification (4)

155. Social Psychology and Medicine (4)

156. Cognitive Development in Infancy (4)

157. Happiness (4)

158. Interpersonal Relationships (4)

159. Physiological Basis of Perception (4)

161. Engineering Psychology (4)

162. Psychology and the Law (4)

164. Criminology (4)

166. History of Psychology (4)

168. Psychological Disorders of Childhood (4)

Prerequisite: Upper-division standing.

169. Brain Damage and Mental Functions (4)

170. Cognitive Neuropsychology (4)

171. Neurobiology of Learning and Memory (4)

172. The Psychology of Human Sexuality (4)

173. Psychology of Food and Behavior (4)

176. Creativity (4)

178. Industrial Organizational Psychology (4)

179. Drugs, Addiction, and Mental Disorders (4)

180. Adolescence (4)

181. Drugs and Behavior (4)

182. Illusions and the Brain (4)

184. Choice and Self-Control (4)

187. Development of Social Cognition (4)

188. Impulse Control Disorders (4)

189. Brain, Behavior, and Evolution (4)

190. Parenting (4)

191. Psychology of Sleep (4)

193. Topics in Psychology (4)

194A. Honors Thesis I (4)

194B. Honors Thesis II (4)

194C. Honors Thesis III (4)

195. Instruction in Psychology (4)

199. Independent Study (2 or 4)