Citation for published item:h¤ onhmmerD tFqF nd qruertD eF nd uerzelD hF nd fekerD FsF @PHITA 9ettentionl guidne y reltive fetures X ehviorl nd eletrophysiologil evideneF9D syhophysiologyFD SQ @UAF ppF IHUREIHVQF Further information on publisher's website: httpsXGGdoiForgGIHFIIIIGpsypFIPTRS Publisher's copyright statement: his is the epted version of the following rtileX h¤ onhmmerD tF qFD qruertD eFD uerzelD hF nd fekerD F sF @PHITAD ettentionl guidne y reltive feturesX fehviorl nd eletrophysiologil evideneF syhophysiologyD SQ@UAX IHUREIHVQD whih hs een pulished in (nl form t httpsXGGdoiForgGIHFIIIIGpsypFIPTRSF his rtile my e used for nonEommeril purposes in ordne ith iley erms nd gonditions for selfErhivingF Additional information:
Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Attentional guidance by relative features 2 Abstract Our ability to select task-relevant information from cluttered visual environments is widely believed to be due to our ability to tune attention to the particular elementary feature values of a sought-after target (e.g., red, orange, yellow). By contrast, recent findings showed that attention is often tuned to feature relationships, viz., features that the target has relative to irrelevant features in the context (e.g., redder, yellower; Becker, 2010). However, the evidence for such a relational account is so far exclusively based on behavioral measures that do not allow a safe inference about early perceptual processes. The present study provides a critical test of the relational account, by measuring an electrophysiological marker in the EEG of participants (N2pc) in response to briefly presented distractors (cues) that could either match the physical features of the target or its relative features. In a first experiment, the target color and non-target color was kept constant across trials. In line with a relational account, we found that only cues with the same relative color as the target were attended, regardless of whether the cues had the same physical color as the target. In a second experiment, we demonstrate that attention is biased to the exact target feature value when the target is embedded in a randomly varying context. Taken together, these results provide the first electrophysiological evidence that attention can modulate early perceptual processes differently; in a contextdependent manner vs. a context-independent manner, resulting in marked differences in the range of colors that can attract attention.Attentional guidance by relative features 3