The Best of Creative Computing Volume 1 (published 1976)

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Computer-Based Experiments in Cognitive Psychology (Sample Run of Pandemonium)

```A SAMPLE RUN

RUN SEARCH

TYPE 1 FOR A SIMULATION, 2 T0 TEST A SUBJECT AND SIMULATE?2

TARGET! TYPE 1 FOR Q, 2 FOR Z, 3 FOR Q OR Z, OR 4 IF YOU WISH TO INPUT YOUR
OWN?1

TYPE 1 IF THE GOAL IS THE PRESENCE OF TARGET LETTER, 2 IF IT IS THE ABSENCE?1

CONTEXT TYPE 1 FOR ROUND, 2 FOR ANGULAR, 3 IF YOU WISH TO INPUT YOUR 0WN?1

WOULD YOU LIKE A PRINTOUT OF THE SEARCH PROCEDURE? TYPE 1 FOR YES, 0 FOR N0?1

PANDEMONIUM SEES: 'C'

LEVEL 1

ELIMINATES: D G R U Q, POSSIBILITIES REMAINING: C 0, THE CHARACTER IS CONTEXT

PANDEMONIUM SEES: 'D'

LEVEL 1

ELIMINATES: C O U, POSSIBILITIES REMAINING: D G R Q

LEVEL 2

ELIMINATES: R, POSSIBILITIES REMAINING: D G Q

LEVEL 3

ELIMINATES: G Q, POSSIBILITIES REMAINING: D, THE CHARACTER IS CONTEXT

PANDEMONIUM SEES: 'G'

LEVEL 1

ELIMINATES: C O U, POSSIBILITIES REMAINING: D G R Q

LEVEL 2

ELIMINATES: R, POSSIBILITIES REMAINING: D G Q

LEVEL 3

ELIMINATES: D Q, POSSIBILITIES REMAINING: G, THE CHARACTER IS CONTEXT
***
Pandemonium's processing of the letter 'C'

Feature-extraction level 1

eliminates all letters having lines or angles (the 'C' has only a curve)

Since the target letter, 'Q,' is among those eliminated, Pandemonium can
conclude that the letter is context and go on to the next letter

Pandemonium's processing of the letter 'D'

Feature-extraction level 1

eliminates all letters not having lines, angles, and curves (the 'D' has all
three). The program treats
the 'O' as being without a slash.

Feature-extraction level 2

eliminates all letters having oblique lines, acute angles, and contlnuous curves
(a 'D' has none of these)

Feature-extraction level 3

eliminates all letters not having one vertical line, two horizontal lines, two
right angles and one discontinuous curve (the 'D' has all of these)
***
PANDEMONIUM SEES: 'O', LEVEL 1, ELIMINATES: D G R U Q, POSSIBILITIES REMAINING:
C 0, THE CHARACTER IS CONTEXT

PANDEMONIUM SEES: 'R'

LEVEL 1

ELIMINATES: C O U, POSSIBILITIES REMAINING: D G R Q

LEVEL 2

ELIMINATES: D G Q, POSSIBILITIES REMAINING: R, THE CHARACTER IS CONTEXT

PANDEMONIUM SEES: 'U'

LEVEL 1

ELIMINATES: C D G O R Q, POSSIBILITIES REMAINING: U, THE CHARACTER IS CONTEXT

PANDEMONIUM SEES: 'Q'

LEVEL 1

ELIMINATES: C O U, POSSIBILITIES REMAINING: D G R Q

LEVEL 2

ELIMINATES: R, POSSIBILITIES REMAINING: D G Q

LEVEL 3

ELIMINATES: D G, POSSIBILITIES REMAINING: Q,  THE CHARACTER IS A TARGET

PROBLEM 1

ORCGDU RGCOUD UDRCGQ CROGUD CORUDG OURCDG OGCRUD ROUGDC CORGUD CDRGOU UOCDGR
DGCRUO ORUCGD UCRGOD RODCGU UODRCG UDCGOR GURCOD OURCDG RGOUDC DUOGRC ODUCRG
UDGCRO DCUOGR DCRUGO GDCORU ORCUGD ORDUCG RCODUG OGUCDR DGCRUO CRDUOG ODUCRG
URDCGO DRUCGO COGURD RGCUDO UCDOGR GOCDUR DORUCG CROUGD ORCUDG DUGRCO GUDCOR
CODUGR GUODCR CROUGD ORUCGD DOCGUR RCGOUD

?

?

LINE 45 SUBJECT TIME 30 in seconds

LINE 45 SIMULATED TIME 4960 arbitrary time units

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