Effects of reducing the number of candidate tasks in voluntary task switching.

This contrast turned out to be highly significant, F (1,78) = 3,298.45, p < 0.0001.

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Finally, a marginally significant ( p < 0.08) interaction of Task Choice and ERPI/IRSI emerged, F (2,154) = 2.69, MSE = 0.00057, being due to the fact that restricted task choices went along with a smaller ER (3.5%) than unrestricted task choices (4.5%) with an ERPI/IRSI combination of 100-2,000, whereas with an ERPI/IRSI combination of 100-100 and 2,000-100, ERs were virtually the same ( p ’s < 0.36) with unrestricted and restricted choices (3.2 vs. 3.1% and 3.6 vs. 3.4%, respectively).

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No other effect approached significance in this analysis (all p ’s > 0.26).

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Replicating the observations of Demanet and Liefooghe (2014) , this contrast failed to reach significance, F (1,78) = 0.96, reflecting the fact that the switch cost of 125 ms measured with an ERPI/IRSI combination of 100-2,000 was similar to the one obtained with 2,000-100 ERPI/IRSI.

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