Chapter Eight Part Two

Chapter Eight: Memory - Lecture Part Two

Overview of the Atkinson-Shiffrin Model

• Definition: The Atkinson-Shiffrin model, also known as the Information Processing model, is a prominent framework for understanding memory.

• Historical Context: Developed in the 1950s and 60s during the rise of computer technology.

• Basic Principle: The model draws parallels between human memory processing and computer information processing.

Components of the Atkinson-Shiffrin Model

1. Sensory Memory

   • Definition: The initial, brief storage of sensory information.

   • Duration: Very short retention of sensory input, generally lasting about 0.25 to 0.5 seconds for visual stimuli (iconic memory) and 2 to 4 seconds for auditory stimuli (echoic memory).

   • Examples:

     • Visual imagery dissipates quickly; for instance, remembering text from a piece of paper after it is moved away.

     • Echoic memory explained through the "white phenomenon" where one hears something important but forgets it immediately due to distraction.

   • Eidetic Memory: Often mistakenly called photographic memory; individuals can recall an image for up to 30 seconds rather than permanently.

2. Short-term Memory (Working Memory)

   • Definition: Also referred to as working memory; it is the system used to hold and manipulate information for a brief period.

   • Capacity: Can hold approximately 5 to 9 bits of information (often represented as $5 ext{ ± } 2$).

   • Duration: Information lasts in short-term memory for about 15 to 30 seconds without rehearsal.

   • Maintenance Rehearsal: A technique to keep information in short-term memory that involves repetition, though it's susceptible to interference.

   • Example: Repeating a phone number to memorize it temporarily.

   • Differences in Memory Types:

     • Example Question: "What is your birthday?" taps into long-term memory for retrieval while being consciously aware of it, illustrating the functioning of short-term memory.

3. Long-term Memory

   • Definition: This type of memory is meant for relatively permanent storage and can hold vast amounts of information.

   • Memory Consolidation: Occurs primarily during sleep, involving transfer of information from short-term to long-term memory, facilitated by the hippocampus.

   • Example in Media: The character from the movie 51st Dates illustrates anterograde amnesia, where memories cannot be formed after each sleep cycle, demonstrating consolidation failure.

Types of Long-term Memory

• Explicit Memory: Information that can be easily recalled (e.g., facts like a mother's name).

• Implicit Memory: Knowledge that is more difficult to consciously retrieve, such as procedural knowledge, e.g., typing one's name.

• Elaborative Rehearsal: A more effective technique for encoding information into long-term memory by associating new information with existing knowledge (e.g., learning languages by finding similarities with known words).

  • Examples: Spanish words similar to English (e.g., inteligente for intelligent). Using contextual ties greatly enhances memory retention.

  • Challenges in Memory: Difficulties arise when new information lacks associations to existing knowledge, making recall more challenging (e.g., learning less familiar languages).

Implications of Memory and Cognitive Processing

• Memory Functionality: The model emphasizes how human memory is structured to manage and retrieve vast amounts of information efficiently, influencing educational strategies and cognitive psychology research.

• Adaptive Functions of Memory: The inability to vividly recall certain sensations (e.g., pain) is deemed adaptive, reducing the likelihood of trauma from re-experiencing pain (e.g., childbirth).

• Personal Binding: The example of memory retrieval's varying ease illustrates the complexity of human cognition and memory access, influencing how we learn and remember information.