Cognitive Psychology: Understanding Mind and Memory
1. Foundations of Cognitive Psychology
Cognitive psychology is defined as the scientific study of knowledge and thought. It is a broad field that investigates how knowledge is acquired, retained, and used, covering topics such as perception, attention, memory, language, reasoning, and decision-making.
The Shift from Introspection to Behaviorism
Using introspection (self-observation) was considered problematic because some thoughts are unconscious, and it is impossible to scientifically test or resolve disagreements between private reports. Additionally, the accuracy of such self-reports is often unknown. Behaviorism emerged as a direct response to, and rejection of, the introspective method.
Gestalt Psychology and the Cognitive Revolution
Gestalt psychology claimed that mental processes and behaviors must be considered as a “whole” rather than individual parts, emphasizing that perceivers actively shape their own experiences. The cognitive revolution (emerging in the 1950s and 60s) was caused by the limitations of behaviorism, which could not explain the creativity of language or learning without immediate behavior changes (such as cognitive maps in rats). It was further influenced by the development of computers, which provided a new model for human information processing.
Interdisciplinary Connections
Psychology is closely related to Philosophy, Neuroscience, Computer Science, and Linguistics. These fields contribute to a broader Cognitive Science by providing different ways of acquiring knowledge about the mind.
2. Mental Representations and Processes
Mental representations are internal forms created in the mind that allow us to think about objects and events even when they are not physically present. Mental processes are operations that act upon these representations, including the acquisition (encoding), storage, transformation, and retrieval of knowledge. Research typically utilizes performance/accuracy measures, response time (RT) measures, and neuroimaging techniques.
3. Attention and Awareness
Attention is a limited mental resource necessary for awareness. Inattentional blindness (e.g., the invisible gorilla experiment) and change blindness (e.g., The Door Study) demonstrate that we often fail to notice salient stimuli when focused elsewhere.
Selection Theories and Priming
Reaching conscious awareness is determined by attention, which prioritizes information based on physical attributes, personal importance (the cocktail party effect), and cognitive load. Early selection theory suggests unattended information is filtered early, while late selection occurs for simple tasks. Priming facilitates attention by making specific detectors fire more readily; this can be repetition-based (stimulus-driven) or expectation-based (effortful).
Practice and Automaticity
Practice reduces the need for executive control, allowing skills to become automatic. The Stroop task illustrates how automatic processes (reading) can interfere with controlled processes (naming ink color).
4. Memory Systems and Processing
Memory involves three main processes: acquisition, storage, and retrieval. Cases like Clive Wearing and HM demonstrate that short-term (working) memory and long-term memory are separate systems.
The Modal Model and Encoding
In the modal model, information moves from sensory memory to short-term memory, then to long-term memory. The primacy effect relates to LTM transfer, while the recency effect relates to working memory. Deep processing (focusing on meaning) is superior to shallow processing (focusing on physical features) because it creates stronger retrieval paths.
5. Everyday Memory and Accuracy
Memory is reconstructive, combining actual events with prior knowledge, schemas, and scripts. This can lead to errors, such as those seen in the DRM paradigm, where people falsely recall theme words. Confidence is not a reliable indicator of accuracy, as seen in cases of eyewitness testimony errors.
6. Conceptual Knowledge
Concepts allow us to recognize objects and navigate the world. We categorize using:
- Prototypes: The “average” or “best example” of a category.
- Exemplar Theory: Comparing items to specific memories of individual members.
- Theory-based knowledge: Understanding essential properties rather than just visual similarity.
We use a combination of these systems to remain flexible, adapting our hierarchies based on goals and context.