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. 2008 Jan 29;18(10):2275–2285. doi: 10.1093/cercor/bhm249

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© 2008 The Authors

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Three example trials from the task used in experiment 1, each including a rule cue, a response cue, and a button press response. The rule cue would indicate whether the response could be chosen (within either heights or color modality) or was specified or that there was no-rule and subjects should wait until the response cue before choosing a response. The response cue had either 1 target (thereby specifying the response) or more than 1 enabling response selection according to the rule (chosen or specified) or free response selection (after no-rule cues). Stimulus onset asynchrony is 4.25 s. Null trials looked like the background screen, introducing a variable interval between active trials. For experiment 2, only height based rules were used, with 1 or 4 targets.