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Table 3. 

DRD4 Long Carriers and Short Homozygotes Neuropsychological Tests for Category Learning and Memory Span Tasks

Long CarriersShort Homozygotes
Category Learning: Screened Sample 
Digit Span 0.48 (0.92) 0.27 (0.9) 
WAIS Vocabulary† 1.09 (0.63) 0.77 (0.88) 
Stroop Interference 0.83 (0.81) 0.63 (0.7) 
WMSIII Delayed Recall 0.59 (0.85) 0.42 (0.99) 
WMSIII Immediate Recall 0.63 (0.54) 0.45 (0.53) 
Composite Memory 0.36 (0.78) 0.2 (0.64) 
 
Memory Span 
Digit Span† 0.92 (0.11) 0.88 (0.18) 
WAIS Vocabulary† 0.5 (0.9) 0.21 (0.84) 
Stroop Interference† 1.08 (0.62) 0.76 (0.88) 
WMSIII Delayed Recall 0.84 (0.8) 0.59 (0.69) 
WMSIII Immediate Recall 0.57 (0.84) 0.33 (0.9) 
Composite Memory† 0.35 (0.78) 0.14 (6) 
Long CarriersShort Homozygotes
Category Learning: Screened Sample 
Digit Span 0.48 (0.92) 0.27 (0.9) 
WAIS Vocabulary† 1.09 (0.63) 0.77 (0.88) 
Stroop Interference 0.83 (0.81) 0.63 (0.7) 
WMSIII Delayed Recall 0.59 (0.85) 0.42 (0.99) 
WMSIII Immediate Recall 0.63 (0.54) 0.45 (0.53) 
Composite Memory 0.36 (0.78) 0.2 (0.64) 
 
Memory Span 
Digit Span† 0.92 (0.11) 0.88 (0.18) 
WAIS Vocabulary† 0.5 (0.9) 0.21 (0.84) 
Stroop Interference† 1.08 (0.62) 0.76 (0.88) 
WMSIII Delayed Recall 0.84 (0.8) 0.59 (0.69) 
WMSIII Immediate Recall 0.57 (0.84) 0.33 (0.9) 
Composite Memory† 0.35 (0.78) 0.14 (6) 

Note that the general sample did not undergo neuropsychological testing.

Composite memory is the average z scores across the three memory tests: Digit Span, WMSIII Delayed Recall, and WMSIII Immediate Recall. 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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