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1. Concepts
1.1 Bias
1.2 Causality
1.3 Change
1.4 Measurement
1.5 Perspective
1.6 Responsibility
2. Content
2.1 Biological Approach
2.2 Cognitive Approach
2.3 Sociocultural Approach
2.4 Research Methodology
3. Contexts
3.1 Health and Well-being
3.2 Human Development
3.3 Human Relationships
3.4 Learning and Cognition
4. Extensions (HL only)
4.1 Culture
4.2 Motivation
4.3 Technology
4.4 Data Analysis and Interpretation
Biological Reductionism
Explaining behaviour by breaking it down into smaller biological components such as genes, neurotransmitters, or brain structures.