Memory

Chapter 6: Memory

The Makings of Memory

• Memory depends on three basic processes:

  • Encoding: Put information into memory.

  • Storage: Maintain information in memory.

  • Retrieval: Recover information from memory.

Types of Memory Codes

• Acoustic: Memory code based on auditory information.

• Visual: Memory code based on visual information.

• Semantic: Memory code based on meaning and understanding.

Types of Long-term Memory

• Episodic: Memory for events in one’s past.

• Procedural: Memory of how to do things, often difficult to express in words, so we show through doing.

• Semantic: General knowledge including facts, concepts, and contextual awareness.

Types of Retrieval

• Recall: Retrieving information from memory without any help.

• Recognition: Retrieval is aided by external cues.

Stages of Memory Processing

1. Sensory Memory:

   • Brief processing of sensory input.

   • Sensory memories fade quickly if not processed further, an adaptive characteristic of the memory system.

2. Short-term Memory:

   • Stage in which information is stored very briefly (less than 20 seconds) for immediate use.

   • Working Memory: Allows manipulation of information being held in short-term memory.

   • Capacity of Short-term Memory: 7 ± 2 items.

   • Chunking: Organizing individual stimuli into larger units of meaningful information to enhance memory retention.

3. Long-term Memory:

   • Information is encoded such that it can be recalled in distant future.

   • Long-term memory typically results from effortful and semantic processing.

Memory Effects

• Serial Position Effects:

  • Primacy Effect: High recall for the first few items in a sequence due to rehearsal leading to encoding in long-term memory.

  • Recency Effect: High recall for the last few items in a sequence as they remain in short-term memory.

Memory Models

Information Processing Model

• One of the oldest and most influential memory models.

• Hypothesizes three stages through which information must pass:

  • Sensory memory

  • Short-term memory

  • Long-term memory

  • This sequence is essential for information to be firmly embedded in memory.

Levels of Processing Model

• Proposes that memory depends on the depth at which we mentally process information.

  • Maintenance Rehearsal: Simplistic rehearsal by repetition to keep information in memory.

  • Elaborative Rehearsal: Relates new information to pre-existing knowledge in memory, promoting deeper understanding and retention.

Transfer-Appropriate Processing Model

• Memory depends on the congruency between encoding processes and retrieval processes.

Neural Network Model

• Suggests that new experiences form and strengthen connections among neurons, organizing and integrating information with existing knowledge.

• Over time, facts learned create a network of information with dynamic connections that change based on experiences.

Multiple Memory Systems Model

• Suggests different types of memory utilize various parts of the brain, often independently as well as in conjunction with each other.

Biological Bases of Memory

Brain Mechanisms

• Brain cells, or neurons, communicate at synapses, which are critical for memory formation.

• Memory formation is associated with changes in synapses:

  • Growth of new synaptic connections.

  • Modification of existing synaptic connections to enhance communication among neural networks.

• Biochemical processes in memory occur in specific brain regions such as the hippocampus and distributed areas throughout the cerebral cortex.

• Regions of the hippocampus and cerebral cortex are notably active during memory retrieval.

Selected Memory Topics

Retrieving Memories

• Encoding Specificity Principle: Retrieval cues assist in memory recovery based on their alignment with how data was originally encoded.

• Tip-of-the-Tongue Phenomenon: Incomplete knowledge stored in memory which does not allow full recall, often due to inadequate retrieval cues.

Context in Memory Retrieval

• Context-Specific Memory: Retrieval influenced by contextual similarities or differences relative to the learning environment.

• State-Dependent Memory: Retrieval influenced by internal state similarities or differences during learning and recall.

Retrieving Semantic Memories

• Spreading Activation: Activation of a concept triggers related concepts, with activation spreading across associated networks.

Constructing “Memories”

• False Memories: Recollections of events incorrectly remembered, including details of non-existent people or objects.

• Memory construction is affected by pre-existing knowledge and contextual familiarity, which can fill gaps in retrieval.

Misinformation Effect

• Occurs when new information interferes with the ability to retrieve the original memory, complicating the distinction between original and new information.

• Trustworthy source statements may be incorrectly assumed to be true, influencing memory.

• Repeated exposure and recall of misinformation can solidify inaccuracies in memories.

Forgetting

• The Forgetting Curve (Ebbinghaus) indicates that memory loss follows a predictable pattern regardless of material type.

• Forgetting can occur for unutilized knowledge, but information can be easy to relearn indicating partial retention despite weakened connections.

Theories of Forgetting

• Decay Theory: Gradual fading of memories over time due to non-use.

• Interference: Processes whereby new or old information impedes storage or retrieval of other information.

Guidelines for More Effective Studying

Note-taking

• Effective note-takers focus on major ideas in fewer words, which promotes better retention compared to capturing every detail.

• Drawing connections with examples and summarizing points enhances memory.

• Handwriting notes may improve retention because it engages deeper cognitive processing.

Strategies for Storing and Remembering

• Mnemonic Devices: Techniques that apply organizational frameworks to aid in memory.

Study Techniques

• PQ4R Method: A process for reading that includes previewing, questioning, reading, reflecting, reciting, and reviewing.

• Caution against relying solely on repetition for long-term retention; emphasis on deeper cognitive engagement.

• Organizational Structures: Forming outlines or other structures where possible.

• Practice Tests: Effective for reinforcing memory.

• Distributed Practice: More effective than cramming, promoting long-term retention.