Year 10 Psychology: Memory and Eye-Witness Testimony

Definition of Memory: Memory is often defined as the processing, storage, and retrieval of information acquired through learning.
Importance of Memory:
  - Life without memory leads to no recollection of past events, leading to difficulties in basic tasks and social interactions.
  - It is pivotal for establishing self-concept; without it, one cannot develop a sense of identity.
  - Memory integrates past experiences with present awareness and future thinking.

Three Fundamental Core Processes:
  1. Encoding:
     - The conversion of information into a form that the brain can understand.
     - Influenced by environmental state and attention levels.
     - Enhanced attention improves encoding accuracy (e.g., focused study vs. distractions).
     - The role of encoding is to neurologically represent information for storage.
  2. Storage:
     - The retention of encoded information over time.
     - Includes short-term and long-term memory systems.
     - Short-term memory has limited capacity and duration.
     - Long-term memory (LTM) is relied upon for recalling witnessed events, with potentially unlimited capacity.
  3. Retrieval:
     - The process of recalling information when needed.
     - Eyewitness accounts often use autobiographical (episodic) memory, recalling personal experiences.
     - Memory is prone to errors; it does not operate like a video tape, thus retrieval may involve reconstructive processes.

Atkinson and Shiffrin's Multi-Store Model:
  - Comprised of three stores: sensory memory, short-term memory, and long-term memory.
  - Sensory Memory:
     - Very short duration and capacity, linked to each sensory register (e.g., visual sensory memory).
     - If attention is not paid, sensory memory cannot transition to short-term memory.
  - Short-Term Memory:
     - Longer duration than sensory memory but still limited in capacity.
  - Long-Term Memory:
     - Characterized by lasting retention of information and skills.
     - It theoretically has unlimited capacity, with accessibility being the key issue for recall.
     - Can be encoded semantically (meaning), visually (pictorial), or acoustically.
     - Analogy: Information is like a saved file on a computer that can be accessed when needed.

Explicit Memories (Declarative Knowledge):
  - Involves “knowing that”.
  - Requires conscious effort to recall information.
  - Sub-types:
    1. Semantic Memory:
       - Stores information about the world (e.g., capital cities).
       - Declarative and involves conscious thought.
    2. Episodic Memory:
       - Stores autobiographical events (e.g., first day at school).
       - Also declarative and involves conscious recall.
Implicit Memories (Non-declarative Knowledge):
  - Involves “knowing how” - with skills and behaviors.
  - Operates unconsciously (e.g., riding a bike).
  - Procedural Memory:
    - Part of implicit memory for motor skills.
    - Not reliant on conscious thought; exemplified through skills already learned.
Phobias:
- A type of implicit long-term memory formed through learned associations.

Types of Long-Term Memory: Categorization and description of explicit and implicit memories, with examples.
Interconnections: Utilization of semantic and episodic memories in recalling different experiences.

Very Long-Term Memory Experiment by Bahrick et al. (1975):
- Investigated memory of graduating class names using various recall methods.
- Results indicated that memory accuracy diminishes over time, with varied retention rates for free recall and recognition tests (e.g., 90% accuracy within 15 years vs. 30% after 48 years).

Mechanism:
  - Adrenaline enhances the consolidation of emotionally arousing long-term memories.
  - Enhanced memory for emotionally significant experiences (both pleasant and unpleasant).
  - Involves activation of the amygdala and its signaling to the hippocampus for strengthening memory storage.
Research Findings:
- The link between emotional significance and memory recall; the more significant the event, the stronger and more detailed the memory.
Flashbulb Memories:
- Vivid, detailed memories of significant or shocking events (e.g., news of a loved one's death).

Retrieval Cues:
  - Any stimulus that assists in locating and recovering stored information.
  - Context-Dependent Cues:
    - Environmental cues present during memory formation enhance recall (e.g., being in the same location).
  - State-Dependent Cues:
    - Internal states (emotional or psychological) during memory encoding aid retrieval (e.g., being in a similar mood).

Memorial Reconstruction:
  - Memory is not a perfect record; it is often reconstructed using beliefs and new information.
  - Example of Memory Reconstruction in Legal Context:
    - A witness may reconstruct a memory with extras gathered over time or through discussions.
  - Implications for Eyewitness Testimony:
    - Leads to potential inaccuracies in recall, highlighting the importance of careful investigative techniques.

Reliability Concerns:
- Eyewitnesses can be influenced by leading questions and suggestions from law enforcement.
- Legal inquiries now emphasize protocols to minimize pressure on witnesses during identifications and testimony.
Case Study: Tom Cole:
- The incident exemplifies the need for structured questioning to prevent memory distortion.

Key Insights:
- Memory formation is complex and nuanced, influenced by various factors that can both aid and impede accurate recall.
- Awareness of memory's reconstructive nature and the psychological mechanisms at play is crucial for both academic and practical applications in fields like psychology and law.