001; other correlations: −0.4 < r < 0.4, P > 0.05). LED did not correlate with BIS-11 and attentional boost PF-02341066 chemical structure (−0.3 < r < 0.3, P > 0.1). Table 2 summarizes the characteristics of the replication sample. Patients with PD and controls were matched for demographic parameters. Two patients with PD had DSM-IV major depressive disorder, and one patient had generalized anxiety disorder. No impulse controls disorders were diagnosed. Patients with PD displayed higher scores than control individuals on HAM-D (Table 2). Patients with PD and control individuals performed similarly

on the letter detection task [patients with PD–target: 93.2% (SD = 3.2), distractor: 61.3% (SD = 4.6); controls–target: 93.3% (SD = 3.1), distractor: 61.6% (SD = 5.6); P > 0.5]. The anova conducted on the scene recognition performance revealed significant main effects of group (F1,28 = 35.73, P < 0.0001, η2 = 0.56) and stimulus type (F2,56 = 63.16, P < 0.0001, η2 = 0.69). The two-way interaction between find more group and stimulus type was significant (F2,56 = 4.93, P < 0.05, η2 = 0.15). Tukey HSD tests indicated that patients with PD showed higher levels of scene recognition than control

individuals when scenes were presented with targets and distractors in the trial sequence (P < 0.01; Fig. 6). We calculated correlations between scene recognition, HAM-D, UPDRS and BIS-11 attention score. In the whole sample (n = 30), we found a significant positive correlation between BIS-11 attention score and recognition performance for distractor-associated scenes (r = 0.41,

P = 0.02). We observed no evidence for attentional dysfunctions in drug-naïve, Progesterone young patients with PD. However, at follow-up when patients with PD received dopamine agonists, we found enhanced attentional boost for both target- and distractor-associated scenes: patients with PD recognized scenes better than control individuals did when scenes were presented with either targets or distractors in the encoding phase. Higher impulsive attention was associated with better scene recognition performance when scenes were presented with distractors in the encoding phase. This finding is against the hypothesis that dopamine selectively enhances memory for reward/target-associated background information. Instead, dopamine enhances attentional impulsivity and facilitates memory for information presented with both targets and distractors. However, there was a specific association between attentional impulsivity and distractor-associated recognition performance. Dopamine agonists and L-DOPA had no general enhancing effect on memory because recognition memory for scenes presented alone was not encouraged. Enhanced attentional boost was not related to the alerting, orienting or executive components of attention, which were not affected by dopaminergic medications. We replicated enhanced attentional boost in elderly patients with PD who received L-DOPA.