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. 2008 Mar 19;4:13. doi: 10.1186/1744-9081-4-13

Figure 2.

Figure 2

Mean number of cards chosen in blocks. 100 card selection trials were grouped into five blocks, each comprising 20 trials. The three factor (repeated measurement) ANOVA (Gain-loss frequencies (gain vs. loss) × Values (± 200 vs. ± 100) × Blocks (1 to 5)) indicated a significant main effect for gain-loss frequencies (F (1, 47) = 29.44, p < .01) and values (F (1, 47) = 9.02, p < .01), but not for blocks (F (1, 47) = 0.00, p = 1.00). Furthermore, significant interactions existed between gain-loss frequencies and blocks (F (4, 44) = 3.03, p < .05) as well as three factors (F (4, 44) = 5.19, p < .01); but non-significant interactions existed between gain-loss frequencies and values (F (1, 47) = 1.90, p = .18); values and blocks (F (4, 44) = 0.99, p = .43). These results indicate a clear preference for the pooled decks A and B ("bad" decks) over the pooled decks C and D ("good" decks) from the beginning. Subjects seem to be guided by gain-loss frequencies and appear sensitive to the gain-loss structure gradually. No cross-over or significant learning curve exists for the high-frequency gain (A, B) and high-frequency loss (C, D) decks under this condition (100 trials) in the Soochow Gambling Task.