Long-term Memory (LTM)
Thought as an archive of info about past events and knowledge learned
- Storage can be from moments ago to as far back as you can remember
-More recent usually more detail
Serial Position Curve (Murdoch)
Memory is better for words presented at the beginning of a heard list and the end. Participants wrote down the words they remembered
Primacy Effect
Memory is better for stimuli presented at the beginning
- Occurred because participants had more time to rehearse the earlier items and experienced less interference while encoding
Recency Effect
Memory is better for stimuli presented at the end of the list
- Occurs because the stimuli were still active in STM at the point at which memory was being tested
Although introducing a delay would remove this effect
Coding
The form in which stimuli is represented
Is auditory coding more common in STM or LTM?
STM
- Phonological similarity effect
Is semantic coding more common in STM or LTM?
LTM
- Recalling the general plot of a novel you read last week
Proactive interference
Occurs when info learned previously interferes with learning new information
- French vocab learned in elementary can iinterefere with Spanish learning in highschool
Retroactive interference
Occurs when learning interferes with remembering old learning
- Hard time remembering your old phone number when you have mastered your new one
The Wickens Experiment
An example of proactive interference
- The condition where all 4 trials were fruit names, and individuals had a hard time encoding the later trials
- In the other condition where the 1st three trials were jobs and the last was fruit the 1st and 4th trial was better encoded.
Neuropsychological approach
Helped understand the involvment of the hippocampus with encoding new long-term memories
Double dissociation in STM and LTM
If the STM is impaired then the LTM is ok (K.F)
If the LTM is impaired then the STM is ok (H.M)
Episodic Memory
-Memory for personal events
- Involves ‘mental time travel’
-No guarantee accuracy
- Multidimensional in nature: can include sensory details, emotional, and contextual
Semantic Memory
What happens if episodic details are lost?
Semantic details can remain
- Accquiring knowledge may start as episodic but fade to semantic
Double dissociation of Episodic and Semantic Memory
-K.C damaged hippocampus; no episodic memory, can relive any events of his past but semantic memory is intact and can remember general info about the past
-LP: impared semantic memory, episodic memory for past events was preserved
What can you do to enhance semantic memory?
If you associate it with episodic details
Autobiographical Memory*
Memory of specific experiences, includes both episodic and semantic memory
Personal Semantic Memory*
Semantic memories that have personal significance
What is the Remember/Know Procedure by Petrican and what are the components?
Procedure to measure familiarity and recollection
-Research has shown that longer interval times from original encoding increases forgetting
1. Remember response
2. Know response
3. Don’t know response
Remember response
If a stimulus is familiar and the circumstances under which it was encountered can be remembered
(smelling and old perfume bringing back memories)
Know response
If the stimulus is familiar, but you can’t remember experiencing it earlier
Don’t know response
Don’t remember the stimulus at all
What were the results of the Remember/ Know procedure?
It shows the semanticization of remote memories
- Loss of episodic details for memories of long-ago events
-Memories of the most recent events are more likely to include episodic memory than less recent.