Lecture Notes: Basic Cognitive Processes - Memory

Introduction

• Presenter: Dr. Ark Verma, IIT Kanpur
• Course Focus: Basic cognitive processes with a focus on memory
• Memory as a pervasive mental phenomenon aiding in interaction with environment

Importance of Memory

• Definition of Memory: Retaining, retrieving, and using information about stimuli, images, events, ideas, skills, etc.
• Memory provides:
  • Sense of self and continuity
  • Source for all experiences and interactions
• Quote by Tennessee Williams: Life is memory, except for the fleeting present moment

Functions of Memory

• Involvement in Daily Tasks:
  • Simple tasks like calculations
  • Complex tasks like storytelling or recalling past events
• Role in Cognitive Functions:
  • Supports thinking, dreaming, and desiring
  • Determines the saliency of events

Models of Memory

• Atkinson and Shiffrin Model: Divides memory into sensory, short-term, and long-term memory
  • Sensory Memory: Brief retention of sensory information
  • Short-Term Memory: Holds information temporarily for immediate use
  • Long-Term Memory: Stores information for extended periods

Processes Involved in Memory

• Control Processes:
  • Rehearsal: Repetition to retain information
  • Selective Attention: Focus on specific stimuli
  • Encoding: Storing information in long-term memory

Example of Memory Processes

• Scenario: Ordering a pizza
  • Information seen in sensory memory
  • Number focused and held in short-term memory
  • Rehearsal leads to storage in long-term memory

Sensory Memory

• Characteristics:
  • Very brief retention of sensory effects
  • Persistence of vision and auditory information
• George Sperling's Experiment (1960):
  • Whole Report Method: Participants reported fewer letters
  • Partial Report Method: Improved accuracy with auditory cues

Findings from Sperling's Experiment

• Conclusion:
  • Sensory memory registers almost all incoming visual information
  • Information rapidly fades, requiring immediate recall
• Sensory Registers:
  • Iconic Memory: Visual sensory memory
  • Echoic Memory: Auditory sensory memory

Importance of Sensory Memory

• Collects and briefly holds information for processing
• Provides continuity in perception (e.g., movies)

Conclusion

• Sensory memory has larger capacity but is short-lived
• Sets the stage for understanding short-term memory in subsequent lectures