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Memory: The Cognitive Process

Defining Memory

Why Memory Matters

Memory is a fundamental cognitive process that enables individuals to encode, store, and retrieve information. It allows us to retain knowledge and personal experiences and use that information later. Understanding memory is vital in psychology to explain how we learn, develop, and function daily.

Classification of Memory Stores

Memory is traditionally categorized by duration and capacity, flowing from immediate sensory input to permanent storage.

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Sensory Memory

Holds sensory input for less than a second (buffer).
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Short-Term Memory (STM)

Limited capacity (7 ± 2 items) and short duration (<30 seconds).
3

Long-Term Memory (LTM)

Seemingly limitless capacity and duration (minutes to a lifetime).

Sensory Memory Details

Sensory memory is the earliest stage of memory, holding sensory information from the environment for a very brief period, usually less than a second.

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Iconic Memory

Related to visual input; lasts only about 0.5 seconds. For example, when you briefly see an image even after it’s gone (like a sparkler’s trail).
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Echoic Memory

Related to auditory input; lasts 2-4 seconds, allowing you to remember the last few words someone just said, even if you weren't paying full attention.

Short-Term Memory (STM) Capacity

7 ± 2 Items
The estimated capacity of Short-Term Memory (Miller, 1956). STM duration is approximately 15-30 seconds without rehearsal. Encoding is typically acoustic (by sound).

LTM: Declarative vs. Procedural

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Declarative (Explicit)Conscious memories such as facts and events. Includes Episodic (personal experiences) and Semantic (knowledge about the world).
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Procedural (Implicit)Memory of skills and actions, often unconscious (e.g., riding a bike).

Multi-Store Model: Strengths & Weaknesses

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StrengthsSupported by experimental evidence, such as the serial position effect. Explains memory as a flow of information through different stores.
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CriticismsOversimplifies processes; ignores complexities of STM and LTM; alternative models have proposed working memory as a more dynamic STM.

Working Memory Model Components

This model (Baddeley and Hitch, 1974) refines STM by describing it as an active system that manipulates information.

1

Central Executive

The control system that directs attention and coordinates activities of the subsystems.
2

Phonological Loop

Processes verbal and auditory information (Phonological Store & Articulatory Process).
3

Visuo-Spatial Sketchpad

Handles visual and spatial information (e.g., remembering a route).
4

Episodic Buffer

Integrates information from the other components and links working memory to LTM.

The Three Memory Processes

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Encoding

The process of converting information into a form usable by the memory system (Acoustic, Visual, Semantic).
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Storage

Involves maintaining encoded information over time. Different stores have varying durations and capacities.
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Retrieval

The process of locating and bringing stored information back into conscious awareness. Effectiveness depends on encoding and cues.

Causes of Forgetting

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Why do I forget things I learned years ago? Is it just time?
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Not just time! That could be Decay Theory. But often it's Interference (old or new memories disrupting recall) or Retrieval Failure (lack of cues).

Key Memory Research

Ultra-compact table of influential studies supporting memory models and theories.

ID Year Researcher Focus Finding
01 1956 Miller STM Capacity 7 ± 2 items (Chunking)
02 1959 Peterson STM Duration Recall of trigrams < 30s
03 1966 Baddeley Encoding LTM is Semantic
04 1974 Loftus Eyewitness Memory can be distorted
05 1975 Bahrick LTM Longevity Recognition recall decades later

Memory Improvement Techniques

Effective methods for enhancing encoding and recall:

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Mnemonics

Devices such as acronyms or rhymes that enhance recall by linking information.
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Chunking

Grouping data into larger units (e.g., phone numbers) to improve STM capacity.
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Rehearsal

Consistent practice, especially elaborative rehearsal, strengthens memory consolidation.
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Use of Imagery

Creating mental images helps encode and retrieve memories (dual coding theory).

Practical Applications

How memory research translates into real-world benefit:

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Eyewitness Testimony

Understanding memory’s reconstructive nature informs legal processes, helping reduce wrongful convictions.
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Education

Techniques like spacing practice and elaborative rehearsal improve learning.
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Clinical Psychology

Understanding memory dysfunction aids in treating conditions like amnesia and dementia.

Ethical Considerations

Integrity in Research

Many memory studies involve deception (e.g., Loftus’s misinformation effect study) to avoid demand characteristics but require debriefing to restore participants’ well-being. Researchers must ensure participants do not suffer long-term distress from false memories or misinformation.
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Memory Flashcards
Term
Memory

What is memory?

Answer
Definition

Memory is the cognitive process of encoding, storing, and retrieving information.

Term
Types of Memory

Name the three main types of memory.

Answer
Types

Sensory memory, Short-term memory (STM), and Long-term memory (LTM).

Term
Iconic Memory

What is iconic memory?

Answer
Definition

A type of sensory memory related to visual input, lasting about 0.5 seconds.

Term
STM Duration and Capacity

What is the typical duration and capacity of short-term memory?

Answer
Details

Duration around 15-30 seconds; capacity about 7 ± 2 items.

Term
Long-Term Memory Types

What are the main types of long-term memory?

Answer
Types

Declarative (explicit) and procedural (implicit).

Term
Multi-Store Model

Who proposed the Multi-Store Model of memory?

Answer
Researchers

Atkinson and Shiffrin (1968).

Term
Rehearsal in STM

What role does rehearsal play in short-term memory?

Answer
Function

It helps maintain information longer in STM and transfers it to LTM.

Term
Central Executive

What is the Central Executive in Baddeley and Hitch’s Working Memory Model?

Answer
Definition

It directs attention and coordinates subsystems of working memory.

Term
Encoding

What is encoding in memory?

Answer
Definition

The process of converting information into a form that memory can store.

Term
Proactive Interference

What is proactive interference?

Answer
Definition

When old memories interfere with learning new information.

Term
STM Capacity Study

Name one key study that demonstrated STM capacity.

Answer
Study

Miller (1956) “7 ± 2 items.”

Term
Chunking

What technique uses grouping information to enhance memory capacity?

Answer
Technique

Chunking.

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🧠 Memory & Cognition Quiz

1. What is the primary encoding type in long-term memory?

Long-term memory mainly encodes information based on meaning.

2. Who developed the Working Memory Model?

They proposed a more active, multi-component system of short-term memory.

3. Which memory store holds sensory information for less than a second?

Sensory memory is a brief buffer for sensory input, lasting less than 1 second.

4. True or False: The capacity of short-term memory is unlimited.

STM capacity is limited to about 7 ± 2 items.

5. What does ‘proactive interference’ refer to?

Proactive interference occurs when previously learned information hinders new learning.

6. The phonological loop is part of which memory model?

The phonological loop handles auditory/verbal information in working memory.

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