Different mechanisms underlie spatial and non-spatial inhibition of return (IOR)
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1
University of Santigo de Compostela, Spain
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2
University of Murcia, Spain
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3
University of A Coruña, Spain
Inhibition of Return (IOR) is a phenomenon that slows responses to target stimuli appearing at previously cued locations (spatial IOR), or sharing some feature with previously presented stimuli (non-spatial IOR) at cue-to-target-onset asynchronies (CTOAs) longer than 300 ms. To further explore the debated mechanisms underlying this phenomenon, event-related potentials (ERP) were obtained during a cueing task. To that end, 20 participants responded to a target red or blue square randomly appearing with the same or different colour, or at the same or different location (upper visual field, UVF, lower visual field, LVF) with regard of a previous uninformative cue (2000 ms CTOA). By combining cue and target location and colour we obtained ‘location new–colour new’, ‘location new–colour old’, ‘location old–colour new’ and ‘location old–colour old’ conditions that allowed us to analyze ERP and behavioural data from trials potentially generating spatial and non-spatial IOR. The task consisted of 400 trials, 2 for each previously cited condition. Half of the stimuli appeared in the UVF, and the other half in the LVF. Response times were slower to targets appearing in old (cued) locations compared to new (uncued) locations, but no differences were found for the colour (new vs. old) conditions. ERP analyses showed effects for both spatial and non-spatial conditions. Specifically, spatial IOR effects were significant in the LVF at the latency of N1 that was reduced in amplitude when targets appeared at old locations. Non-spatial IOR effects were observed in the UVF at the latency of P3 that showed lower amplitude to old colour targets. These results indicate that IOR is a non-unitary phenomenon that may be related to different attentional mechanisms. Funding: Supported by grants PSI2010-21427 from the Spanish 'Ministerio de Investigación, Ciencia e Innovación (MICINN)' and 10PXIB211220PR from Xunta de Galicia.
Keywords:
Attention,
IOR
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Cognition and Attention
Citation:
Gutiérrez-Domínguez
F,
Pazo-Álvarez
P,
Darriba
Á,
Doallo
S,
Fuentes
L,
Lorenzo-López
L and
Amenedo
E
(2011). Different mechanisms underlie spatial and non-spatial inhibition of return (IOR).
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00311
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Received:
22 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Francisco-Javier Gutiérrez-Domínguez, University of Santigo de Compostela, Santiago de Compostela, Spain, franciscojavier.gutierrez@usc.es