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Sensory Memory Iconic Memory Echoic Memory
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Iconic Memory What is the evidence? Subjective experience Objective measurements Judge duration of a light Interference Sperling’s (1960) work capacity decay (forgetting)
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Sensory Memory Iconic Memory Echoic Memory also called Precategorical Acoustic Store (PAS)
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Echoic Memory What is the evidence? Interference Darwin, Turvey & Crowder’s (1972) work capacity (auditory span of apprehension) decay (forgetting) Modality Effect (in terminal list positions)
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Demo
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Echoic Memory What is the evidence? Interference Suffix Effect or Stimulus Suffix Effect
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P(r) 1.0 0.0 Proportion of Items Recalled as a Function of List Position and List Type List Position 1 2 3 4 5 6 7 8 9
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P(r) 1.0 0.0 Proportion of Items Recalled as a Function of List Position and List Type List Position 1 2 3 4 5 6 7 8 9 No suffix (tap or tone control) Suffix
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P(r) 1.0 0.0 Proportion of Errors as a Function of List Position and List Type List Position 1 2 3 4 5 6 7 8 9 No suffix (tap or tone control) Suffix
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Echoic Memory What is the evidence? Interference Suffix Effect or Stimulus Suffix Effect suffix cue to recall hurts performance --a sort of backward mask affects only end positions particularly the final position
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Echoic Memory What is the evidence? Interference Darwin, Turvey & Crowder’s (1972) work capacity (auditory span of apprehension) decay (forgetting) Modality Effect (in end list positions)
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Echoic Memory Darwin, Turvey & Crowder’s (1972) work present auditory matrix of letters (quickly) task—report letters whole report partial report
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Headphones
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“L 2 K”“4 F 8” “9 G X”
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Headphones “L 2 K”“4 F 8” “9 G X” Letters/numbers sound like they are coming from 3 different locations
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Report all of the letters/digits—whole report participants do okay (but not great)
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“L 2 K”“4 F 8” “9 G X” Partial report -- Light cue signals report from 1 location
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Whole report – 4.2 letters/digits Partial report – about 1.63 letters/digits x 3 locations = 4.9 letters/digits Partial report superiority Why?
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Whole report – 4.2 letters/digits Partial report – about 1.63 letters/digits x 3 locations = 4.9 letters/digits Partial report superiority Why? Relatively fast forgetting.
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Darwin, Turvey, & Crowder’s (1972) work Partial report delay report of row (w/ delayed cue) track performance as a function of delay (retention interval)
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Probability of Report as Function of Time P(r) 1.0 0.0 Time (s) 0 1 2 3 4
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Probability of Report as Function of Time P(r) 1.00 0.0 Time (s) 0 1 2 3 4.60
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Probability of Report as Function of Time P(r) 1.00 0.0 Time (s) 0 1 2 3 4.60 4.9 letters/digits 4.3 letters/digits (whole report about 4.2)
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Conclusion: Acoustic info or echo decays quickly (in about 4 s) Important point: Acoustic info fades more slowly than visual info This difference in decay rates is consistent with idea of different visual and acoustic stores
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Echoic Memory What is the evidence? Interference Darwin, Turvey & Crowder’s (1972) work capacity (auditory span of apprehension) decay (forgetting) Modality Effect (in terminal list positions)
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Demo
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P(r) 1.0 0.0 Proportion of Items Recalled as a Function of List Position and Presentation Modality List Position 1 2 3 4 5 6 7 8 9
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P(r) 1.0 0.0 Proportion of Items Recalled as a Function of List Position and Presentation Modality List Position 1 2 3 4 5 6 7 8 9 Auditory Visual
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Echoic Memory What is the evidence? Modality Effect performance for stimuli presented in one modality better than performance for stimuli presented in a different modality In this case: auditory > visual In this case: Effect occurs only in the end (terminal) list positions
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Echoic Memory (Precategorical Acoustic Store) What is the evidence? Interference Darwin, Turvey & Crowder’s (1972) work capacity (auditory span of apprehension) decay (forgetting) Modality Effect (in terminal list positions)
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Echoic Memory (Precategorical Acoustic Store) A few problems:
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Echoic Memory (Precategorical Acoustic Store) A few problems: 1) Reasoning: Acoustic info fades in about 4 s Acoustic interference should occur for suffixes presented up to roughly 4 s after the final item Suffix effect should disappear after about 4 s
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Echoic Memory (Precategorical Acoustic Store) A few problems: 1) Suffix effect obtained after 20-s delay (Watkins & Todres, 1980)
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Echoic Memory (Precategorical Acoustic Store) A few problems: 2) Reasoning: Acoustic info fades in about 4 s Modality effect should occur for retention intervals of 4 s or less Modality effect should not occur after 4-s retention interval
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Echoic Memory (Precategorical Acoustic Store) A few problems: 1) Suffix effect obtained after 20-s delay (Watkins & Todres, 1980) 2) Modality effect obtained after 20-s retention interval (Watkins & Watkins, 1980)
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Have a good day!
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