Full text: Algebraic decomposition of individual choice behavior

3.10. EXPERIMENT 3B: DISCRIMINATION 
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3.10 Experiment 3B: Discrimination 
The results from Experiment 3A suggest that there is no effect of block design 
on consistency of discrimination. Hence, the alternative hypothesis could not 
be specified and no systematic effects were expected from the variation of 
block designs across sessions. 
3.10.1 Method 
The same method and stimuli as in Experiment 3A was applied. 
Design 
The same design as in Experiment 2B was applied. In a 2 x 3 design (sequence by session) 
with repeated measurement on the second factor each subject chose between stimuli in three 
sessions under different block designs. Two different sequences of block designs over three 
sessions were tested in Group SNP and PNS. 
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Group SNP: In the first session subjects chose under a reSolution block design, in the 
second under a raNdom block design, and in the third under a rePetition block design. 
Group PNS: In the first session subjects chose under a rePetition block design, in the 
second under a raNdom block design, and in the third under a reSolution block design. 
Dependent variables were the choices and response times as well as measures of inconsistency 
(reversals, intransitive triples, dicycles, and ear dicycles). As in the previous experiments 
it was hypothesized that the different block designs would affect the consistency of the 
discrimination performance. 
Subjects 
A total of 20 undergraduate and graduate students who also took part in Experiment 2A 
or 2B were recruited from the subject panel of the Department of Experimental Psychology, 
Oxford University. There were 10 subjects in each group (Group SNP: average age 24.5 
years, SD 5.21; Group PNS: average age 27.3 years, SD 6.43). Both groups were balanced 
in gender. All subjects had normal or corrected-to-normal vision. Each subject received £3 
per hour plus traveling expenses. 
Materials and Apparatus 
The same equipment, stimuli and set-up as in Experiment 3A was used. 
Procedure 
The procedure was the same as in Experiment 3A. Each session was preceded by a session 
of Experiment 24 or 2B and lasted between six and twelve minutes.
	        
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