1 / 9

Millers 1956 Magical Number 72

rowdy
Download Presentation

Millers 1956 Magical Number 72

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Miller's (1956) „Magical Number 7??2“ Miller, George A. (1956) The Magical Number Seven, Plus or Minus Two. Some Limits on our capacity for processing information. Psychological Review, 63, 81-97. http://psyclassics.yorku.ca/Miller/

    2. Evidence for the magical number 7 in memory research: Absolute judgement of unidimensional stimuli: tones: when subjects are asked to identify tones (with numbers 1,2,3,etc.) they do well in a comparison up to 6 tones beyond which their judgement becomes vague.

    3. loudness: Over an intensity range from 15-110 db we can discriminate 2.3 bits, i.e., 5 alternatives.

    4. Absolute judgement of unidimensional stimuli: taste: concentration of salt soltions: Over an intensity range from 0.3-34.7 g NaCl /100 water we can discriminate 1.9 bits, i.e., 4 alternatives.

    5. Absolute judgement of unidimensional stimuli: visual position of a target point between two scale markers. Over a range from 5 – 50 positions, we can discriminate 10-15 alternatives.

    6. Summary Unidimensional stimuli

    7. Judgements on multidimensional stimuli

    8. Evidence from other areas:

    9. Chunking We can memorize 7??2 chunks, irrespective of their content: binary digits: 0 1 1 0 1 0 1 decimal digits: 7.5 6.3 1.3 6.9 5.5 3.6 2.3 letters: L M O Z G V C letter+dec dig: S6.5 L2.3 O7.8 X3.7 A4.1 M5.6 Q5.8 mono-syll words: road bent time get car sun end

    10. Chunking through Recoding Memory span is a fixed number of chunks. Chunks, however, can be hierarchically structured with each level recoding the information of the lower ones. Expl: Morse: 1. tone duration . . . - - - . . . 9 chunks 2. letter S O S 3 chunks 3. word „SOS“ 1 chunk

More Related