Memory Components: Sensory and Short-Term Memory Overview

Overview of Memory Components

  • Memory Types: Memory can be categorized into different components; major focus on sensory and short-term memory.

  • William James: Acknowledged the existence of different types or components of memory in the late 19th century.

  • Primary Memory: Current contents of consciousness (what you are aware of now).

  • Secondary Memory: Mental representations of things that are not currently in consciousness (long-term memory today).

Basic Memory Process

  • Retrieval Process: Involves bringing information from secondary memory (long-term) back to primary memory (short-term).

  • Example: Remembering your grade three teacher's name from secondary memory to primary memory.

Memory Chart:

  • Primary Memory Components:

  • Sensory Memory

  • Short-term Memory

  • Secondary Memory Component: Long-term Memory

  • Types of Long-term Memory:

  • Declarative/Explicit Memory: Requires effort to recall (e.g. facts).

  • Non-declarative/Implicit Memory: Automatic recall (e.g. motor skills).

Modal Model of Memory

  • Components: Information passes between sensory memory, short-term memory, and long-term memory.

  1. Sensory Memory: Briefly holds incoming sensory information from the external world (vision, hearing, etc.).

  2. Short-Term Memory: Limited information retention for a short duration (approximately 15-30 seconds).

    • Rehearsal: Active process to keep information in short-term memory.

    • Encoding: Process of transferring information to long-term memory.

  3. Long-Term Memory: Permanent store of knowledge and past experiences.

Specific Types of Memory Storage

Sensory Memory

  • Function: Acts as a buffer for incoming sensory information; extremely large capacity but very short duration.

  • Iconic Memory: Visual information storage.

  • Echoic Memory: Auditory information storage.

  • Persistence of Vision: Example of iconic memory being utilized in visual phenomena (e.g., sparklers in the dark).

Iconic Memory

  • Duration: Less than one second, retains visual information briefly.

  • Persistence of Vision: Blending of visual information results in perceived motion in films.

  • Sperling's Experiment: Demonstrated iconic memory capacity using partial and whole report methods.

Echoic Memory

  • Duration: Holds auditory information for slightly longer than iconic memory (episodic experience).

  • Allows for processing spoken language, giving time to understand sentences as they are formed.

  • Example: Responding to a question asked while distracted.

Short-Term Memory

  • Duration: Approximately 15-30 seconds, requiring active rehearsal to retain information longer.

  • Capacity Limitation: Typically can hold between 5 to 9 items (George Miller's '7±2' rule).

  • Digit Span Task: Commonly used to measure short-term memory capacity.

  • Chunking: Strategy to group items together to improve recall ability; useful during study and revision.

Memory Dynamics

  • Rehearsal Techniques: Method of retaining information by actively thinking about it repeatedly.

  • Utilization of chunking to minimize the number of unique items to remember, improving recall (e.g., remembering phone numbers).

Conclusion

  • Coverage of fundamental concepts relating to sensory memory and short-term memory, setting a foundation for understanding how we process and retrieve memories in future lectures.

  • Next discussions will deepen understanding of these memory components and their applications in psychology.