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Forgetting An inability to retrieve from LTM

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Page 1: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

Forgetting

An inability to retrieve from LTM

Page 2: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

But is forgetting necessarily a retrieval failure?

• “RetrievaI failure” implies the information is there and just not accessible.

• Was it inadequately stored, or learned, when we acquired it?

• Has it actually decayed with time?

Page 3: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

Important questions, because we would like to know

• How might we minimize forgetting?

• How can we remember what we wish and forget what we’d rather forget?

• Should we attempt to interfere with forgetting, or does forgetting serve an essential purpose?

Page 4: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

Hermann Ebbinghaus

• In 1885, using himself as subject, studied forgetting, using nonsense syllables (why?)

• Plotted a forgetting curve, testing himself at various intervals after learning, and found that memory did decline with time passage

Page 5: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

I. Transience

Pattern of forgetting over time

• Early theorists suggested that decay of memories accounts for forgetting

• Some evidence does suggest that unused memories are forgotten.

Page 6: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

Interference

• Recent research suggests much more forgetting occurs due to Interference

• Proactive Interference: Previously learned information inhibits our ability to remember new information

Page 7: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

• Retroactive Interference: New information inhibits our ability to remember old information

Page 8: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there
Page 9: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

• Especially potent when retrieval cues are identical or very similar

(e.g., learning new/forgetting old locker combinations)

Page 10: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

II. Blocking

Temporary inability to retrieve something known

Very common: forgetting the name of a CD, someone’s name you know, etc.

Page 11: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

TOT Phenomenon

• Experienced as inability to recall a fact, word, name, etc., that we are absolutely certain we know and have stored in LTM;

The memory is temporarily inaccessible.

For example,

Page 12: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

>Patronage bestowed on a relative, in business or politics is

Page 13: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

• Often due to interference from words similar in sound, number of syllables, 1st letter, etc.: they keep recurring as we try to remember target word

Page 14: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

>An astronomical instrument for finding position is

Page 15: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

III. Absentmindedness

Inattentive or shallow encoding of events

Where your keys are, name of person you just met, whether you took your vitamins, etc.

Page 16: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

• Described as explaining “change blindness” – inability to detect changes to an object or scene

• Well-known example: individual asking directions “changes” to another person

Page 17: Forgetting An inability to retrieve from LTM. But is forgetting necessarily a retrieval failure? “RetrievaI failure” implies the information is there

Amnesia

• Extreme forgetting: inability to retrieve vast quantities of information from LTM

• Anterograde and retrograde