Memory Models and Processes

Overview of Memory

  • Definition:

    • Memory is a system for storing, recording, and retrieving information.

    • It operates on both short term and long term levels.

Impact of Conscious States on Memory

  • Factors affecting memory include:

    • Use of psychoactive substances

    • Meditation practices

    • Sleep deprivation

  • Key Concept:

    • States of consciousness can significantly affect memory function.

    • Active processes of memory occur notably during REM sleep.

Main Memory Models

  • Overview of Four Main Models:

    1. Parallel Distributed Processing (PDP)

    2. Levels of Processing

    3. Information Processing Model (Computer Model)

    4. Traditional Memory Model

  • Brief historical perspective on models:

    • Traditional model: studied for about 70 years

    • PDP: developed in the last 15-20 years

Parallel Distributed Processing (PDP)

  • Definition:

    • The PDP model emphasizes vast neural networks in the brain that operate simultaneously for information processing.

  • Key Areas of the Brain:

    • Hippocampus

    • Amygdala

    • Dorsal striatum

  • Concept:

    • Memory acquisition involves various areas of the brain working together to store and retrieve information.

Levels of Processing

  • Core Idea:

    • The depth at which information is processed affects how well it is remembered.

  • Levels of Processing:

    • Shallow processing (e.g., recognizing a name) vs. Deep processing (e.g., personal significance of a birthday).

    • Examples of levels:

    • Shallow: basic word structure

    • Deep: significant dates and personal connections

  • Identified by:

    • Craik and Lockhart

  • Implications:

    • More profound connections yield stronger memory retention.

Information Processing Model

  • Stages of Memory Processing:

    1. Encoding

    2. Storage

    3. Retrieval

  • Encoding:

    • The process of inputting information into the memory system.

  • Storage:

    • Holding information in memory, the duration varies.

  • Retrieval:

    • Accessing stored information, which can be challenging.

  • Encoding Specificity Principle:

    • Retrieval success correlates with the similarities between the conditions present at encoding and retrieval.

  • Example Applications:

    • Study environments should resemble exam conditions to improve recall.

Traditional Memory Model

  • Components:

    • Sensory Memory

    • Short Term Memory

    • Long Term Memory

  • Sensory Memory:

    • Duration and Types:

    • Visual: approx. 0.5 seconds

    • Auditory: approx. 3-4 seconds

    • Tactile: approx. 10 seconds

  • Short Term Memory:

    • Also known as working memory.

    • Capacity:

    • George Miller's “magic number”: 7 ± 2 items

    • Typical duration: approx. 30 seconds

    • Factors Affecting Retention:

    • Attention plays a crucial role in memory retention.

  • Long Term Memory:

    • Information moves from short-term to long-term based on significance and processing depth.

  • Components of Short-term Memory:

    1. Central Executive (CEO of Memory)

    2. VisuoSpatial Sketchpad (handles visual/spatial information)

    3. Phonological Loop (handles auditory information)

  • Efficacy of transferring information to long-term memory depends on the interplay of these components and the input modalities utilized.

  • Further discussion on long-term memory and its subdivisions to continue in next session.