Proefschrift_Holstein

Reward modulation of cognitive function: aging

A

Reward e ect on task switching

2

r = - 0.368, p < 0.001 *

1

(SAT) 0

-1

10

20

30

40

50

60

70

Age (years)

high (switch - repeat) - low (switch - repeat)

B

Reward e ect in repeat condition

Reward e ect in switch condition

r = 0.311, p < 0.001 *

r = - 0.367, p < 0.001 *

reward-related increase in speed-over-accuracy

1

1

0

0

(SAT)

-1

-1

reward-related decrease in speed-over-accuracy

high reward - low reward 10 30

10

30

50

70

50

70

Age (years)

Age (years)

Figure 5.2 Effects of Reward on Task switching as function of Age A: The effect of a high versus low reward on task switching correlated negatively with age, with reduced reward-related changes in task-switching as participants are older. B: Breaking down this negative correlation between Age, Reward, and Task switching (in A) for repeat and switch trials revealed opposite age-related changes in the reward effect on repeat and switch trials. Whereas younger participants showed a reward-related decrease in speed-over-accuracy on repeat trials (left) and a reward-related increase in speed-over-accuracy on switch trials (right), this difference was abolished with increasing age. * Regression lines indicate the Pearson correlation (N = 118), statistics are Spearman correlations.

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