These tasks were designed to induce asymmetric between-task competition, with the location task expected to be the stronger task of the pair.
Thus, our findings indicate that preparation for shape repetitions was less cognitively demanding than preparation for task switches or for repetitions of the stronger task.
Allport and colleagues [ 16] have argued that the extra inhibition of the stronger task set is required to enhance performance with the weaker task set, and therefore, inhibition carries over to the next trial.
These CNV findings complement and extend existing theoretical accounts of switching asymmetries observed behaviorally, which have typically been taken to show that execution of the weaker task makes the switch toward the stronger task more difficult (Gilbert and Shallice 2002; Yeung and Monsell 2003).
Taken with the finding that CNV amplitude in our study tended to be increased on trials with faster RTs (cf. Lavric et al. 2008), these results suggest that the CNV provides an index of active intentional control and that advance preparation of the stronger task requires more intentional control than advance preparation of the weaker task.
But, West Country patriot that he was, the then-Labour leader nailed his colours to the flag and backed Margaret Thatcher's dispatch of the 40,000-strong task force that took the islands back – aware as Foot must have been that his own election hopes would be sunk along with the Argentinian cruiser Belgrano and several Royal Navy warships.
This many candidates' strongest task because you have a lot of control over what happens.
The difference between the strong association task and the global Navon task approached significance (P = 0.056).
There was no difference in accuracy between the strong association task and the local Navon task (P > 0.2).
This analysis revealed that P3 was reduced at the short RSI compared with the long RSI, F1,15 = 7.79; P = 0.014, for the stronger location task compared with the more difficult shape task, F1,15 = 7.27; P = 0.017, and on switch trials compared with repeat trials, F1,15 = 5.32; P = 0.036.
