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Table 5. 
Component (C) Loadings from Principal Component Analysis of Bromocriptine (Top) and Tolcapone (Middle, Bottom) Drug Effects
BromocriptineC1C2
Δ distractor acc cost 0.78   
Δ distractor RT cost   0.74 
Δ switch acc cost 0.77   
Δ switch RT cost   −0.73 
  
TolcaponeC1C2
Δ distractor acc cost 0.88   
Δ distractor RT cost 0.74   
Δ switch acc cost 0.57 0.39 
Δ switch RT cost   0.96 
  
Tolcapone (Rotated)C1′C2′
Δ distractor acc cost 0.79 0.38 
Δ distractor RT cost 0.65 0.35 
Δ switch acc cost 0.69   
Δ switch RT cost 0.50 −0.82 
BromocriptineC1C2
Δ distractor acc cost 0.78   
Δ distractor RT cost   0.74 
Δ switch acc cost 0.77   
Δ switch RT cost   −0.73 
  
TolcaponeC1C2
Δ distractor acc cost 0.88   
Δ distractor RT cost 0.74   
Δ switch acc cost 0.57 0.39 
Δ switch RT cost   0.96 
  
Tolcapone (Rotated)C1′C2′
Δ distractor acc cost 0.79 0.38 
Δ distractor RT cost 0.65 0.35 
Δ switch acc cost 0.69   
Δ switch RT cost 0.50 −0.82 

For each analysis, four input variables included drug-related change scores (i.e., drug − placebo) for distractor and switch costs (i.e., distractor/switch performance − ongoing task performance). Bottom panel depicts tolcapone component loadings after Procrustes rotation was used to best match bromocriptine components. Loadings are thresholded at |0.3|.

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