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Table 4. 

Average Dependent Measures for the White Subset of DRD4 Long Carriers and Short Homozygotes for the Category Learning and Memory Span Tasks

Long CarriersShort Homozygotes
Category Learning: Block 1 
General Sample 
 Overall accuracy 0.7 (0.13) 0.68 (0.17) 
 Similar exemplar accuracy 0.77 (0.18) 0.74 (0.21) 
 Dissimilar exemplar accuracy 0.61 (0.11) 0.61 (0.15) 
 Salient feature weight 0.04 (0.06) 0.06 (0.07) 
 Minor feature weight 0.19 (0.4) 0.18 (0.38) 
Screened Sample 
 Overall accuracy 0.71 (0.16) 0.7 (0.13) 
 Similar exemplar accuracy 0.77 (0.2) 0.76 (0.17) 
 Dissimilar exemplar accuracy 0.63 (0.15) 0.63 (0.13) 
 Salient feature weight 0.05 (0.1) 0.05 (0.07) 
 Minor feature weight 0.13 (0.34) 0.19 (0.4) 
 
Category Learning: Block 2 
Screened Sample 
 Overall accuracy* 0.78 (0.1) 0.71 (0.12) 
 Similar exemplar accuracy* 0.86 (0.13) 0.79 (0.15) 
 Dissimilar exemplar accuracy 0.67 (0.12) 0.62 (0.13) 
 Salient feature weight 0.19 (0.2) 0.15 (0.19) 
 Minor feature weight* 0.03 (0.04) 0.07 (0.09) 
 
Memory Span 
Score** 50 (12.98) 41.94 (16.31) 
Proportion correct* 0.85 (0.09) 0.8 (0.15) 
Long CarriersShort Homozygotes
Category Learning: Block 1 
General Sample 
 Overall accuracy 0.7 (0.13) 0.68 (0.17) 
 Similar exemplar accuracy 0.77 (0.18) 0.74 (0.21) 
 Dissimilar exemplar accuracy 0.61 (0.11) 0.61 (0.15) 
 Salient feature weight 0.04 (0.06) 0.06 (0.07) 
 Minor feature weight 0.19 (0.4) 0.18 (0.38) 
Screened Sample 
 Overall accuracy 0.71 (0.16) 0.7 (0.13) 
 Similar exemplar accuracy 0.77 (0.2) 0.76 (0.17) 
 Dissimilar exemplar accuracy 0.63 (0.15) 0.63 (0.13) 
 Salient feature weight 0.05 (0.1) 0.05 (0.07) 
 Minor feature weight 0.13 (0.34) 0.19 (0.4) 
 
Category Learning: Block 2 
Screened Sample 
 Overall accuracy* 0.78 (0.1) 0.71 (0.12) 
 Similar exemplar accuracy* 0.86 (0.13) 0.79 (0.15) 
 Dissimilar exemplar accuracy 0.67 (0.12) 0.62 (0.13) 
 Salient feature weight 0.19 (0.2) 0.15 (0.19) 
 Minor feature weight* 0.03 (0.04) 0.07 (0.09) 
 
Memory Span 
Score** 50 (12.98) 41.94 (16.31) 
Proportion correct* 0.85 (0.09) 0.8 (0.15) 

Standard deviations are listed in parentheses. Independent samples t tests.

*Significant at p < .05.

**Significant at p < .01.

***Significant at p < .001.

†Marginally significant at p < .10.

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