Memory as a process — Memory involves encoding information, retaining it and retrieving it when needed. Failure at any stage can affect later performance. A poor test result does not identify which stage failed, so an explanation should specify the task and the evidence distinguishing storage from access.
The multi-store proposal — The multi-store model distinguishes sensory registers, short-term memory and long-term memory. Attention selects a small part of sensory input for short-term processing; rehearsal can help maintain information and contribute to transfer. These stores are theoretical constructs inferred from performance, not three literal boxes in the brain.A simplified theoretical transfer route. Retrieval also operates from long-term to short-term processing; the boxes are not anatomical compartments.
Sensory registers — Sensory traces are modality-specific, meaning that different senses have distinct forms of temporary storage, and very brief, retaining more incoming information than a person normally reports. If attention selects only part of a display, poor whole-report performance does not mean the initial trace contained only those reported items. Delayed partial-report cues help investigate this distinction. Visual iconic traces typically persist for a fraction of a second, while auditory echoic traces can last several seconds; these are modality- and task-dependent estimates, not one duration for every sensory register.
Short-term coding — Short-term verbal recall often relies on acoustic coding, shown by confusion between similar-sounding items. This is not a claim that all short-term representations are auditory: visual and other codes can also matter. State what a particular comparison establishes rather than turning a tendency into an exclusive rule.
Capacity and chunks — Immediate memory has a limited capacity, but a chunk is a meaningful unit whose size depends on knowledge and grouping. Remembering familiar letter groups can preserve more letters without increasing the number of independently managed chunks. Estimates depend on the task, rehearsal and material. Miller's historical estimate is often summarised as about seven chunks, plus or minus two, for immediate span. It is not a universal fixed number of raw letters: grouping, rehearsal, familiarity and the task affect estimates.
Duration and rehearsal — Interference tasks that prevent rehearsal can reduce short-term recall after a brief delay. They help separate active maintenance from retention without rehearsal, but forgetting may reflect interference as well as trace decay. A delay alone does not isolate time as the cause. Peterson and Peterson tested consonant trigrams with backward counting over delays from 3 to 18 seconds. Recall declined sharply at longer delays; the method illustrates retention over seconds without ordinary rehearsal, while interference remains an alternative to pure decay.
Long-term coding and retention — Long-term memory often depends strongly on meaning and can preserve information over long intervals. Its large capacity is inferred rather than measured as a precise unlimited quantity. Recognition and recall provide different retrieval support, so successful recognition can coexist with unsuccessful free recall. Long-term retention can extend over years or decades; duration depends on material, learning and retrieval support rather than one exact expiry time.
Evidence for separate stores — Serial-position effects are differences in recall depending on where an item appeared in a list. Better recall of early items is called primacy; better recall of the final items is called recency. These patterns and patterns of impairment can support distinguishable memory functions. A recency advantage that is disrupted by a filled delay is consistent with a short-term contribution. One contrast does not establish that every long-term memory shares a single code or mechanism.
Limits of simple transfer — Meaningful elaboration and existing knowledge can promote later memory more effectively than rote repetition alone. The multi-store model's simple rehearsal route is therefore incomplete as an account of learning. Explain how a comparison challenges the proposed mechanism rather than merely calling the model simplistic.
The working memory model — The working memory model explains active temporary processing through coordinated components. It treats short-term cognition as more than one passive store. Dual-task interference is informative because tasks sharing a component should compete more than tasks using partly different resources.Components have different proposed functions. This comparison is not a serial route through three stores or a claim of complete independence.
Central executive — The central executive directs attention, switches tasks and coordinates other components. It is limited in capacity and is not a large store of words or pictures. Its broad description risks explaining difficulty after the event unless the proposed control operation is independently specified.
Phonological loop — The loop supports temporary verbal and sound-based information. A phonological store holds traces, while articulatory rehearsal can refresh them. Articulatory suppression, such as repeating an irrelevant word aloud while trying to remember a list, interferes with rehearsal; its effect depends on whether material is presented verbally or must first be recoded from vision.
Word length and similarity — Longer words can be harder to rehearse within a limited interval, and similar sounds can be confused. These patterns support aspects of the loop, but word familiarity, pronunciation time and experimental demands need consideration. A single effect does not prove that rehearsal is the only maintenance process.
Visuo-spatial sketchpad — The sketchpad temporarily handles visual appearance and spatial information. Remembering a route while performing another spatial task may create interference even if neither involves spoken words. Visual and spatial demands can themselves be distinguished rather than assuming all non-verbal tasks use one identical operation.
Episodic buffer — The episodic buffer integrates information from different components and long-term knowledge into a temporary coherent representation. Remembering a sentence as a meaningful episode requires more than storing disconnected sounds. The buffer's proposed integrative role differs from the executive's control function.
Evaluating working memory — Selective impairments and dual-task patterns support differentiated processing, but brain damage may affect several systems and compensatory strategies. A finding of less interference across modalities supports partial independence, not completely isolated modules. Compare what each model explains and which predictions were actually tested.
Forgetting and retrieval
Interference — Interference occurs when competing information disrupts learning or retrieval. Similar material is particularly likely to compete because cues do not distinguish it well. The account concerns interaction between memories rather than simply the passage of time.
Proactive interference — Previously learned information disrupts later learning or recall. A well-practised old password intruding when a person tries to recall its replacement is proactive interference. Identify the target and the competing memory before deciding the direction.
Retroactive interference — New learning disrupts recall of older information. After learning a replacement password, a person may struggle to recall the original one. The direction is retroactive because the newer information interferes with the older target, regardless of which answer is more useful now.
Testing interference — A meaningful design compares target recall after competing learning with recall after a matched interval without that competing material. Control similarity, initial learning and retrieval conditions. If the comparison groups differ in study time, poorer recall cannot be attributed solely to interference.
Retrieval failure — Stored information may be inaccessible because suitable cues are absent. A cue helps most when it was associated with the information during encoding and is useful for distinguishing the target. Failure to retrieve now does not establish that the original memory has been erased.
Encoding specificity — Retrieval can improve when relevant features of the original encoding context are reinstated. The useful relation is between encoding and retrieval, not a rule that every matching detail always helps. A cue present in many unrelated episodes may have little diagnostic value.
Context and state cues — Context-dependent cues concern the external setting; state-dependent cues concern internal conditions. Recalling information better in a matched room differs from recalling it better in a matched mood or physiological state. These are explanations of cue effectiveness, not advice to recreate harmful states.
Application and limits — Generating meaningful retrieval cues and practising retrieval across varied contexts can help access. A context effect on a free-recall task may be weaker when recognition supplies the target alternatives. Discuss the task's available cues before generalising a finding to every examination situation.
Eyewitness evidence
Reconstructive remembering — An eyewitness report reconstructs an event using retained information, expectations and later information. A sincere and confident report can therefore be inaccurate. This does not make all eyewitnesses unreliable; identify the particular condition that could alter encoding, storage or reporting.
Leading questions — A question can imply an answer through its wording or assumptions. Asking how fast a car was going when it smashed into another vehicle differs from neutrally asking what happened. A changed answer could reflect altered memory or a response bias, which require different tests.
Post-event discussion — Witnesses who exchange accounts can incorporate details from another person's report. Social agreement may reflect trust or pressure, and later source confusion can make the borrowed detail seem personally observed. Separate independent accounts early when evaluating contamination risk.
Anxiety and attention — Anxiety can affect attention during an event, but its effect is not uniformly helpful or harmful. Attention may narrow towards a threatening central feature while peripheral detail receives less processing. The relation depends on intensity, task and what information is tested.
Weapon focus and alternatives — Attention to a weapon can coincide with poorer identification of other features. The effect may involve threat, unusualness or both. A fair comparison should separate an object's threat from its novelty rather than attributing every difference to anxiety.
Ethics and real events — Laboratory manipulations allow control but cannot ethically reproduce every real threat. Studies of real events may have greater relevance but cannot randomly allocate trauma and may contain uncontrolled differences. Evaluate complementary strengths rather than declaring one method universally superior.
Cognitive interview principles — The cognitive interview aims to improve retrieval while reducing interviewer interference. Its techniques include mentally reinstating context, reporting all remembered details, recalling in a different order and changing perspective within the original procedure. They are retrieval prompts, not instructions to invent missing events.
Context reinstatement — A witness is invited to reconstruct relevant surroundings and internal experience associated with the event. The proposed mechanism is access through overlapping retrieval cues. The interviewer should avoid supplying imagined details that the witness then mistakes for their own recollection.
Report everything — Witnesses may omit uncertain or apparently trivial details. Encouraging a fuller report can provide useful cues and leads, but uncertainty must remain visible. More details are not automatically more accurate details, so evaluate both correct and incorrect information.
Order and perspective — Changing recall order may disrupt a routine narrative, while the original perspective technique attempts additional retrieval routes. Neither should encourage speculation about events outside the witness's knowledge. Techniques can differ in usefulness, difficulty and vulnerability to misleading implementation.
Evaluating the interview — Assess accuracy proportion, number of correct details, number of errors, time and interviewer training. An increase in correct details can coexist with an increase in errors. Standard interview comparisons also differ, so identify which procedures and outcomes were actually measured.
Applied memory judgement — When evaluating a witness or learning method, distinguish the claim, the evidence and its conditions. Connect a leading question to a plausible reporting or memory mechanism, or a retrieval strategy to a specified cue. A short quiz cannot establish the accuracy of an actual witness account.
Test yourself
50 questions · Random sets of 10. These quick checks support revision; practise longer explanations and justified judgements too.
Mr Kidman's Classroom
