Using temporally aligned event-related potentials for the investigation of attention shifts prior to and during saccades

Autor(en)

Christoph Huber-Huber, Thomas Ditye, Maria Marchante Fernandez, Ulrich Ansorge

Abstrakt

According to the pre-motor theory of attention, attention is shifted to a saccade's landing position before the saccade is executed. Such pre-saccadic attention shifts are usually studied in psychophysical dual-task conditions, with a target-discrimination task before saccade onset. Here, we present a novel approach to investigate pre-saccadic attention shifts with the help of event-related potentials (ERPs). Participants executed one or two saccades to color-defined targets while ERPs and eye-movements were recorded. In single-target blocks participants executed a single saccade. In two-targets blocks participants made either a single saccade to one of the targets, or two successive saccades to both targets. Importantly, in two-targets blocks, targets could appear on the same or on opposite sides of the vertical midline. This allowed us to study contra-to-ipsilateral ERP differences (such as the N2pc or PCN) that reflect attention shifts to the targets, prior to saccade onset and during saccades. If pre-saccadic attention shifts to saccade target locations are necessary for saccade execution and if searched-for saccade targets capture attention, there should be enhanced attentional competition (1) between two targets compared to single targets; (2) between two opposite-sides targets compared to two same-side targets; and (3) in two saccades rather than one saccade conditions: More attentional competition was expected to delay saccade latency and to weaken pre-saccadic laterality effects in ERPs. Hypotheses were tested by means of temporally aligned ERPs that were simultaneously time-locked to stimulus onsets, saccade onsets, and saccade offsets. Predictions (1) and (2) were partly and fully confirmed, respectively, but no evidence was found for (3). We explain the implications of our results for the role of attention during saccade preparation, and we point out how temporally aligned ERPs compare to ICA-based electroencephalogram (EEG) artifact correction procedures and to psychophysical dual-task approaches.

Organisation(en)

Institut für Psychologie der Kognition, Emotion und Methoden

Externe Organisation(en)

Universität Osnabrück

Journal

Neuropsychologia

Band

92

Seiten

129-141

Anzahl der Seiten

13

ISSN

0028-3932

DOI

https://doi.org/10.1016/j.neuropsychologia.2016.03.035

Publikationsdatum

11-2016

Peer-reviewed

Ja

ÖFOS 2012

501011 Kognitionspsychologie

Schlagwörter

ASJC Scopus Sachgebiete

Experimental and Cognitive Psychology, Cognitive Neuroscience, Behavioral Neuroscience

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/using-temporally-aligned-eventrelated-potentials-for-the-investigation-of-attention-shifts-prior-to-and-during-saccades(5b8bab46-29d3-4e43-be6f-72e830b3d102).html