Schema Theory
Schema theory explains how the mind organizes and uses mental representations called schemas to process information efficiently. These stored knowledge structures shape perception, memory, and decision-making by helping us categorize experiences and predict future events.
Schemas influence both encoding, by shaping how sensory input is stored in long-term memory, and retrieval, by affecting how information is extracted.
Types of Schema
- Cognitive Schema: Stable, deeply rooted mental representations of knowledge about the world, events, or people.
- Scripts: Schemas related to sequences of events (e.g., how to behave in a restaurant).
- Self-Schemas: Mental representations about oneself, which influence self-perception and behavior.
- Social Schemas: Generalized ideas about groups of people, often contributing to stereotypes.
Functions of Schemas
- Simplify information processing: By categorizing knowledge, schemas save cognitive energy.
- Guide behavior: Predict future actions or events based on past experiences.
- Influence memory: Affect both encoding (storing new information) and retrieval (recalling stored information).
- Fill in gaps: Provide missing details in incomplete information, often through scripts.
Key Studies
Case studyBransford and Johnson (1972)
Aim
To investigate how providing context influences comprehension and recall of text passages.
Method
Experiment with an independent measures design. Participants were divided into five groups with different contextual conditions.
Procedure
- Participants listened to a passage of text describing a vague scenario.
- The five groups experienced the following conditions:
- No context (1): Heard the passage once.
- No context (2): Heard the passage twice.
- Context before: Viewed a picture providing context before hearing the passage.
- Context after: Viewed the picture after hearing the passage.
- Partial context: Viewed a partial picture.
- Participants were asked to recall as many idea units from the passage as possible.
Results
- The context before group recalled significantly more ideas (8.0) than other groups (3.6–4.0).
- Having context beforehand created a schema, enhancing encoding and recall.
Conclusion
Providing context activated schemas, enabling participants to relate new information to existing knowledge, improving memory encoding.
Case study
Anderson and Pichert (1978)
Aim
To investigate how schemas influence memory retrieval.
Method
- Experiment with a mixed design.
- Participants were introductory psychology students.
Procedure
- Participants were assigned one of two perspectives: burglar or homebuyer.
- They read a passage about a house containing 73 details relevant to both perspectives.
- After a filler task, they recalled the passage.
- Participants then either kept their original perspective or switched to the other.
- They recalled the passage again without rereading it.
Results
- In the first recall, participants remembered details relevant to their assigned perspective.
- After switching perspectives, participants recalled an additional 7.1% of details relevant to the new perspective.
- Perspective changes influenced retrieval, not encoding.
Conclusion
Schemas act as filters for memory retrieval, focusing on perspective-relevant information.
