Professor Richard Allen discusses the interconnectedness of memory and language, focusing on the processes of encoding and retrieval.
Reading References
Roediger III, H. L., & Karpicke, J. D. (2018): "Reflections on the resurgence of interest in the testing effect." Perspectives on Psychological Science, 13(2), 236-241.
Craik, F. I. (2020): "Remembering: An activity of mind and brain." Annual Review of Psychology, 71, 1-24.
Principles of Encoding and Retrieval
Key Concepts:
Encoding activity: The initial process of perceiving and registering information into the memory system.
Scheduling learning and retrieval: Managing when and how information is revisited to maximize long-term storage.
Retrieval Cues
Definition: Information used to aid recall by triggering the memory trace.
Can be both internal (thoughts, emotions, physiological states) or external (environmental factors, smells, sounds).
Examples include associations, semantic links, context, and mood.
Impact of Effective Retrieval Cues:
The probability of successful retrieval is a function of the overlap between the information stored and the cues available.
If effective retrieval cues are established during learning, subsequent retrieval will improve significantly.
The Process of Retrieval
Definition:
"Retrieval is a process of recapitulating the same processes (as nearly as possible) as those carried out at the time of encoding." (Craik, 2020, p. 10)
Characteristics:
Retrieval is erratic, fallible, and heavily reliant on cues (Bjork & Bjork, 1992, p. 36).
It is an active reconstruction process rather than a literal playback of a video recording.
Principles of Encoding Specificity
Two Similar Principles
Encoding Specificity:
Events are encoded as patterns of features that, when matched or overlapping during retrieval, act as effective cues. (Tulving & Osler, 1968; Tulving & Thomson, 1973).
This explains why recognition is often easier than recall; the stimulus itself provides a high degree of overlap with the encoded trace.
Transfer Appropriate Processing (TAP):
Emphasizes the overlap between the cognitive processes performed at encoding and those required at retrieval.
Example: If you study by thinking about the meaning (semantic), a semantic test will yield better results than a rhyming test (Morris et al., 1977).
Context-Dependent Memory
Diving Study by Godden & Baddeley (1975):
Scuba divers learned lists of words either on land or underwater.
Results showed that recall was significantly better (40%) when the environment at retrieval matched the environment at encoding (e.g., land-land vs. land-water).
Smith et al. (1978):
Studied how varied contexts (presentation methods, different rooms on campus, specific times of day) influence memory. They found that even imagining the original room can aid retrieval (mental reinstatement of context).
State and Mood Dependency:
Match between the learner's internal environment (e.g., being caffeinated vs. sober, or happy vs. sad) during encoding and retrieval.
Mood Congruence: The tendency to recall memories that are consistent with one's current mood.
Context-dependent effects are generally more reliable in free recall than in recognition tasks.
Mnemonic Techniques: Offloading to the Environment
External Mnemonic Devices:
Used historically by various oral cultures to preserve complex societal data.
Examples:
Beaded accessories (Luba tribe, Congo) for tribal history (Roberts & Roberts, 1996).
Quipus (knotted cords) for numerical and narrative information in Incan cultures (Ascher & Ascher, 1981).
Cognitive Offloading:
Using external tools (calendars, smartphones, notes) to reduce cognitive load and provide retrieval cues (Risko & Gilbert, 2016).
The Photo-Taking Impairment Effect: Taking a photo of an object can lead to poorer memory of the object's details because the brain "offloads" the memory to the camera (Henkel, 2014).
Mnemonic Techniques: Memory Systems
Durable Memories and Neural Coding
Method of Loci:
The "Memory Palace" technique. Visualizing information in a familiar physical space.
Neuroimaging shows that memory athletes exhibit increased connectivity between the medial prefrontal cortex and the right dorsolateral prefrontal cortex after training.
Graphical Representation:
Data typically shows that while control groups recall roughly 7±2 items, trained mnemonists can recall hundreds of items by utilizing structured spatial cues.
Active Memory Engagement
Quote by James (1890): "The one who thinks over his experiences most, and weaves them into systematic relations with each other will be the one with the best memory…"
Engagement in Learning: Memory requires active effort to link material to current goals or existing mental structures (Zinchenko, 1962).
Generation Effect: Material is better remembered if it is generated from one's own mind rather than simply read (e.g., completing a word fragment like "f_ _t" for "fast" vs. just reading "fast") (Slamecka & Graf, 1978).
Levels of Processing (LoP)
Definition by Craik & Lockhart (1972): Proposes that memory durability is a by-product of the depth of processing.
Processing Types:
Structural/Shallow: Identifying the physical traits (e.g., is the word in capital letters?).
Phonemic/Intermediate: Identifying the sound (e.g., does it rhyme with 'cat'?).
Semantic/Deep: Identifying the meaning (e.g., does it fit in the sentence 'The ____ climbed the tree'?).
Classifications:
Type I (Maintenance Rehearsal): Repeating information at the same level.
Type II (Elaborative Rehearsal): Processing information to a deeper, more meaningful level.
Vagueness of 'Depth': Critiqued for being circular; we know it was processed 'deeply' because it was remembered, and it was remembered because it was 'deep' (Baddeley, 1978).
Importance of Attention in Memory
Attention's Role: Critical during the encoding phase; divided attention at encoding significantly harms later retrieval. Divided attention at retrieval has a smaller impact but slows down the process (Craik et al., 1996).
Absent-Mindedness: Often results from a failure of prospective memory or a lack of attention during the encoding of routine actions (Schacter, 1999).
Curiosity and Memory
Dopaminergic Reward Circuitry: Piqued curiosity activates the substantia nigra/ventral tegmental area (SN/VTA) and the hippocampus, making the brain a "sponge" for both the target and incidental information (Gruber et al., 2014).
Schemas and Memory
Role of Schemas: Mental frameworks that help us organize and interpret information. They can lead to memory distortions (e.g., Bartlett's "War of the Ghosts" study).
Schema-Congruent vs. Incongruent:
Congruent: Easily integrated via the neocortex.
Incongruent: Causes "prediction error," which requires the hippocampus for more effortful encoding, but often results in very vivid memory due to its distinctiveness.
Knowledge and Memory Organisation
Chunking: Chess experts (Chase & Simon, 1973) can recall positions of 20−25 pieces from a real game because they see them as meaningful "chunks," whereas novices only recall 4−5 pieces.
Long-Term Working Memory: Experts use their vast LTM to expand the functional capacity of their WM (Ericsson & Kintsch, 1995).
Practice and Its Effects on Memory
Ebbinghaus’s Forgetting Curve: Hypothesized that we lose roughly 50% of new information within an hour unless we review it.
The Total Time Hypothesis: Generally, the amount learned depends on the time spent learning, but the distribution of that time is more critical.
Distributed Practice and Learning
Spaced vs. Massed: Spacing involves breaks between study sessions; massing (cramming) leads to rapid forgetting.
The Illusion of Mastery: Massed practice feels effective because of high performance during the session, but it doesn't lead to long-term "durability" (Kornell, 2009).
Interleaving: Mixing different topics (A-B-C-A-C-B) forces the brain to constantly restart and differentiate, which improves long-term retention compared to blocked practice (A-A-A, B-B-B).
Successive Relearning
Schedule: A strategy involving practicing a task until it is performed correctly, then relearning it over multiple spaced sessions.
Research shows a 3×3 schedule (3 correct recalls across 3 spaced sessions) can increase exam scores by one or two letter grades (Rawson et al., 2013).
Mechanisms of Learning Difficulties
Desirable Difficulties: Concepts that make learning feel harder and slower in the short term (like testing and spacing) but lead to superior long-term retention (Bjork & Bjork, 1992).
Retrieval Path Strength: Successful retrieval doesn't just measure memory; it strengthens the neural pathways, making future retrieval easier.
Summary of Effective Learning Techniques
High Utility: Practice Testing (retrieval practice) and Distributed Practice.
Moderate Utility: Elaborative Interrogation, Self-Explanation, and Interleaved Practice.
Low Utility: Summarization, Highlighting, Keywords, Imagery, and Rereading (these often lead to an illusion of competence without deep processing).