lec04-2 - Short-Term Memory Psychology 355: Cognitive...

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Short-Term Memory Psychology 355: Cognitive Psychology Winter Quarter 2009 1/28/2009
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P 355, Miyamoto, Winter '09 2 Outline • Capacity limits on short term memory • Chunking, recoding, and the role of organization in short-term memory • Memory codes (phonological, visual, spatial, . ...) Next: Modal Memory Model
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P 355, Miyamoto, Winter '09 3 Modal Model of Memory Sensory Memory Short-Term Memory Long-Term Memory Output: Speech/Actions Input Control Processes Next: What are the Limits on Memory Capacity?
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P 355, Miyamoto, Winter '09 4 What Are the Limits on Memory Capacity? • Sensory memory – very large, approximately unlimited Short-Term memory – ? Long-Term memory – very large, approximately unlimited • Limit on memory capacity refers to a limit on the amount of information that can be held in memory. o Not the amount of information that can be input to memory (encoding), and not the amount of information that can be retrieved from memory (retrieval). • Short-term memory (STM) has a very tight limitation: George Miller, "The Magic Number Seven, Plus or Minus Two" Next: Demo on Measuring Memory Span
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P 355, Miyamoto, Winter '09 5 Demo: Memory Span for Digits • On each trial, you will see a sequence of numbers (digits) presented one after the other. • Your Task: Write down all of the digits in the order in which they were presented. • For example, if you see 4 Æ 8 Æ 7 Æ 8 Write down: 4 8 7 8 Next: Demo with 4 Digits
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P 355, Miyamoto, Winter '09 6 Digit Span Trial with 4 Digits *
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P 355, Miyamoto, Winter '09 7 Digit 7
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P 355, Miyamoto, Winter '09 8 Digit 3
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P 355, Miyamoto, Winter '09 9 Digit 2
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P 355, Miyamoto, Winter '09 10 Digit 5
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P 355, Miyamoto, Winter '09 11 What Were the Digits? • Correct Answer 7 3 2 5 Next: Demo with 8 Digits
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P 355, Miyamoto, Winter '09 12 Digit Span Trial with 8 Digits *
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P 355, Miyamoto, Winter '09 13 Digit 9
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P 355, Miyamoto, Winter '09 14 Digit 6
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P 355, Miyamoto, Winter '09 15 Digit 2
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P 355, Miyamoto, Winter '09 16 Digit 8
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P 355, Miyamoto, Winter '09 17 Digit 1
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P 355, Miyamoto, Winter '09 18 Digit 2
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P 355, Miyamoto, Winter '09 19 Digit 5
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P 355, Miyamoto, Winter '09 20 Digit 7
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21 What Were the Digits? • Correct Answer
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lec04-2 - Short-Term Memory Psychology 355: Cognitive...

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