Forgetting, Memory Errors, and Eyewitness Issues Study Pack

Kibin's free study pack on Forgetting, Memory Errors, and Eyewitness Issues includes a 7-section study guide, 25 quiz questions, 30 flashcards, and 5 open-ended Explain review questions. Sign up free to track your progress toward mastery, plus upload your own notes and recordings to create personalized study packs organized by course.

Last updated May 28, 2026

Topic mastery0%
Save progress →

Forgetting, Memory Errors, and Eyewitness Issues Study Guide

Unpack why memory fails — from Ebbinghaus's forgetting curve and proactive interference to Loftus's misinformation effect and eyewitness unreliability.

Key Takeaways

  • •Forgetting follows a predictable decay curve first described by Hermann Ebbinghaus, showing that most information is lost rapidly after initial encoding unless actively rehearsed.
  • •Interference — both proactive (old memories disrupting new ones) and retroactive (new memories disrupting old ones) — is a primary cause of retrieval failure rather than simple decay.
  • •Motivated forgetting includes repression, where emotionally threatening memories are pushed out of conscious awareness, and suppression, where forgetting is a deliberate, conscious act.
  • •Memory is reconstructive, not reproductive: each retrieval involves actively rebuilding an event from fragments, schemas, and post-event information, making errors and distortions inevitable.
  • •The misinformation effect, documented extensively by Elizabeth Loftus, shows that exposure to misleading post-event information can alter or replace details in an original memory.
  • •Eyewitness testimony is highly persuasive to juries yet highly unreliable — cross-racial identification, weapon focus, stress, and suggestive questioning all reduce accuracy without reducing witness confidence.
  • •Source monitoring errors occur when a person correctly remembers a piece of information but misattributes where or when they originally encountered it.

Why Memories Fade: Decay, Disuse, and the Forgetting Curve

Not all forgetting is the result of interference or distortion — some information simply weakens over time when it is never retrieved or rehearsed, a pattern that researchers have studied since the late nineteenth century.

Ebbinghaus's Forgetting Curve

  • •Hermann Ebbinghaus systematically tested his own memory for nonsense syllables and found that forgetting is steepest in the first hours after learning, then gradually levels off — a pattern called the forgetting curve.
  • •The curve suggests that roughly half of newly learned material can be lost within the first day if no review takes place.
  • •Spaced practice (spreading study sessions out over time) dramatically slows the decline because each retrieval attempt strengthens the memory trace.

Trace Decay Theory

  • •Trace decay theory proposes that the physical or neural representation of a memory — called the memory trace — deteriorates through biological processes if it goes unused.
  • •Most cognitive psychologists view decay as one contributing factor rather than the sole cause of forgetting, since research shows that context and interference also matter enormously.
  • •Decay is most relevant to sensory memory (which lasts milliseconds to seconds) and is less well established as the main cause of long-term memory loss.

Interference: When Memories Compete

Interference occurs when two or more memories conflict with each other during encoding or retrieval, and it is considered one of the most powerful and well-documented causes of forgetting in long-term memory.

Proactive Interference

  • •Proactive interference happens when older, previously learned information disrupts the ability to encode or recall newer information.
  • •A classic example is a person who has used the same ATM PIN for years struggling to remember a newly changed PIN because the old one keeps intruding.
  • •The strength of proactive interference increases with the similarity between old and new material — more similar content competes more aggressively.

Retroactive Interference

  • •Retroactive interference occurs when recently learned information works backward to disrupt recall of earlier material.
  • •Students who study two similar subjects back-to-back often find that the second subject impairs their memory for the first.
  • •Retroactive interference is one reason sleep aids memory consolidation — during sleep, no new competing information is being processed.

Retrieval Failure and Encoding Specificity

  • •Sometimes a memory is not lost but simply inaccessible because the right retrieval cue is absent — a phenomenon related to the encoding specificity principle, which holds that recall is best when retrieval conditions match the original encoding context.
  • •The tip-of-the-tongue state is a well-known example of retrieval failure: the memory exists but cannot be fully accessed at that moment.
  • •Re-creating the emotional, environmental, or cognitive context of original learning can restore access to seemingly lost memories.

Motivated Forgetting and Emotional Memory Distortions

Some forgetting is driven not by passive decay or competition between memories but by psychological motivation — the mind's tendency to avoid, suppress, or distort experiences that are threatening, painful, or inconsistent with self-image.

Repression vs. Suppression

  • •Repression, a concept originating in Freudian psychoanalytic theory, refers to the unconscious exclusion of distressing memories from awareness — the person has no deliberate intent to forget and is unaware the memory has been pushed out.
  • •Suppression is the conscious, intentional effort to avoid thinking about an unwanted memory, such as deliberately redirecting attention away from a painful event.
  • •Researchers disagree about whether repression truly occurs as a distinct mechanism; empirical evidence for robust, complete repression of traumatic memories is contested, though many psychologists accept motivated forgetting in milder forms.

Flashbulb Memories and Their Limitations

  • •Flashbulb memories are vivid, confident recollections of emotionally charged public or personal events — such as where one was when learning of a major disaster.
  • •Despite feeling unusually accurate, flashbulb memories are subject to the same distortions as ordinary memories; people's confidence in their accuracy far exceeds their actual accuracy over time.
  • •High emotional arousal during an event can narrow attention, improving memory for the central emotional detail while degrading memory for peripheral details.

Memory as Reconstruction: Schemas, Distortion, and False Memories

Memory researchers broadly agree that remembering is not like playing back a recording — it is an active, constructive process in which the brain fills gaps using prior knowledge, expectations, and schemas, opening the door to systematic errors.

Schema-Driven Distortion

  • •A schema is a mental framework representing general knowledge about a category of events or objects (e.g., what typically happens at a restaurant or in a classroom).
  • •When a memory is incomplete, the brain automatically fills gaps with schema-consistent information, which means people often remember what should have happened rather than what actually did.
  • •Frederic Bartlett's early work with the story 'War of the Ghosts' demonstrated that participants consistently altered unfamiliar cultural details to fit their own cultural schemas when recalling the story days later.

False Memory Formation

  • •False memories are recollections of events that never occurred or that differ substantially from how the event actually unfolded.
  • •The Deese-Roediger-McDermott (DRM) paradigm reliably produces false memories in the laboratory: when participants study a list of words all related to a non-presented theme word (e.g., 'sleep'), they frequently and confidently recall the theme word as having appeared on the list.
  • •False memories feel subjectively real to the person holding them; there is no reliable internal signal that distinguishes a true memory from a false one.

The Misinformation Effect

  • •Elizabeth Loftus demonstrated the misinformation effect through landmark experiments in which participants who watched a filmed accident and later received misleading verbal information — such as being asked about 'the speed of the cars when they smashed' rather than 'hit' — subsequently reported higher speed estimates and were more likely to falsely remember broken glass.
  • •Post-event information can be incorporated into the original memory trace, altering or replacing the original detail rather than simply coexisting alongside it.
  • •Misinformation effects are stronger when the misleading information is delivered by a perceived authority, when time has passed since the original event, and when the person does not realize they have been exposed to post-event suggestion.

Unlock the rest of this study guide

  • Access the full study pack
  • Track your mastery and be test-day ready
  • Upload your own notes to build personalized study guides, quizzes, flashcards, and more
Sign up free →

About this Study Pack

Created by Kibin to help students review key concepts, prepare for exams, and study more effectively. This Study Pack was checked for accuracy and curriculum alignment using authoritative educational sources. See sources below.

Sources

More in Psychology 101

See all topics →

Browse other courses

See all courses →