Memory: A group of related mental processes involved in acquiring, storing, and retrieving information.
Definition: Mental processes that enable the encoding, retaining, and retrieving of information over time.
Three Major Processes of Memory
Three fundamental processes:
Encoding: Transforming information into a format that can be stored in memory.
Storage: Retaining information in memory for later use.
Retrieval: Recovering stored information for conscious awareness.
The Three-Stage Model of Memory
Information is transferred from one memory stage to another:
Sensory Memory:
Registers a vast amount of information for a very short period.
Short-term Memory (STM):
Temporarily holds information currently being thought about or consciously aware of.
Long-term Memory (LTM):
Long-term storage of information, potentially lasting a lifetime.
Sensory Memory
Function: Briefly stores sensory impressions to help perceive the world as continuous.
Types of Sensory Memory:
Auditory Sensory Memory (Echoic Memory):
Brief memory lasting up to 3-4 seconds, allowing for hearing speech as continuous.
Visual Sensory Memory (Iconic Memory):
Brief memory of visual images, lasting approximately 1/4 to 1/2 second.
Measured by George Sperling’s partial report technique.
Short-Term Memory and Working Memory
Definition of Short-term Memory: Temporary storage for information from sensory memory and long-term memory.
Duration of Short-term Memory: Lasts up to 20 seconds; longer retention through maintenance rehearsal.
Capacity of Short-term Memory:
Limited to “The Magical Number Seven, Plus or Minus Two” (George Miller).
Chunking: A strategy to improve retention by grouping related items.
Current research suggests a revised magical number of around four plus or minus one when chunking is not possible.
Working Memory Model (Alan Baddeley)
Definition of Working Memory: Involves temporary storage and active manipulation of information for complex cognitive tasks.
Components of Working Memory:
Phonological Loop: Handles verbal information.
Visuospatial Sketchpad: Handles visual and spatial information.
Central Executive: Directs attention and coordinates information from the two slave systems.
Long-Term Memory
Definition of Long-term Memory: Storage of information over extended periods; potentially lifelong.
Characteristics:
Limitless capacity, involves quick retrieval with minimal effort.
Encoding Strategies for Long-term Memory:
Elaborate Rehearsal: focuses on meaning.
Self-reference Effect: Relating information to oneself.
Visual Imagery: Creating vivid images.
Types of Long-term Memory:
Procedural Memory: How to perform tasks and skills.
Semantic Memory: General knowledge and facts.
Episodic Memory: Memory of specific events.
Implicit and Explicit Memory
Explicit Memory (Declarative Memory): Memory with awareness, consciously recollected information.
Subtypes:
Episodic Memory: Events or episodes.
Semantic Memory: Facts and general knowledge.
Implicit Memory (Nondeclarative Memory): Memory without awareness affecting behavior without conscious recollection; includes motor skills.
Culture’s Effects on Early Memory
Cultural differences shape autobiographical memories, which typically form between ages 2-4 through family interactions:
American vs. Chinese/Taiwanese memory patterns.
Organizing Information in Long-Term Memory
Clustering: Related items cluster together into higher categories for better recall.
Importance of contextual organization; poorer recall occurs with random presentation.
Retrieval: Getting Information from Long-Term Memory
Definition of Retrieval: Process of accessing and retrieving stored information.
Importance of Retrieval Cues: Success relies heavily on appropriate retrieval cues.
Common Retrieval Glitches:
Tip-of-the-Tongue Experience (TOT): Knowledge stored in memory but inaccessible; often resolves within minutes.
Testing Retrieval
Recall: Retrieving memories without cues (free recall).
Cued Recall: Remembering with aids.
Recognition: Identifying correct information from multiple choices.
Serial Position Effect
Tendency to remember items at the beginning (primacy effect) and end (recency effect) of a list better than those in the middle.
Encoding Specificity Principle
Retrieval is more successful when conditions of retrieval match those of encoding.
Context Effects: Better recall in the same setting where learning occurred.
Mood Congruence: Mood influences the retrieval of similarly-themed memories.
Flashbulb Memories
Detailed recollections surrounding significant events; confidence does not guarantee accuracy, as they too decay over time.
Forgetting: When Retrieval Fails
Definition of Forgetting: Inability to retrieve previously available information.
Hermann Ebbinghaus and the Forgetting Curve:
Rapid loss soon after learning; depends on initial encoding quality.
Reasons for Forgetting
Encoding Failure: Insufficient initial encoding.
Decay Theory: Memory traces fade over time, though not the primary cause of forgetting.
Interference Theory:
Memories can interfere with each other; includes:
Retroactive Interference: New information impedes recall of old.
Proactive Interference: Old information hinders new.
Motivated Forgetting:
Suppression: Conscious effort to forget.
Repression: Unconscious action of recalling unpleasant memories.
Imperfect Memories: Errors, Distortions, and False Memories
Memories can be distorted; confidence in a memory does not assure accuracy.
Misinformation Effect: Post-event information alters recall.
Schemas: Pre-existing schemas aid memory formation but can distort memories.
Biological Basis of Memory
Memory is tied to physical changes in the brain; changes can be localized or distributed.
Neuronal Changes: Memory traces involve structural/functional changes in neurons; investigated by Eric Kandel.
Amnesia and Memory Loss
Types of Amnesia:
Retrograde Amnesia: Loss of previous episodic memory due to injury.
Anterograde Amnesia: Inability to form new memories, often related to hippocampal damage.
Dementia: Progressive deterioration of cognitive functions; Alzheimer’s is the most common form, marked by brain changes (beta-amyloid plaques and neurofibrillary tangles).
Dementia Villages and Memory Innovations
Aging population trends; introduction of dementia villages aimed at humanized care for dementia patients.