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FIGURE 26.2. Results from McDonald et al.


Results from McDonald et al.’s (2005) temporal-order-judgment experiment. (a) Schematic illustration of events on a simultaneous-target trial (top) and nonsimultaneous target trials (bottom). Participants indicated whether a red or a green target appeared first. SOA between cue and first target event was 100–300 ms, and SOA between nonsimultaneous targets was 35 or 70 ms. T1 and T2 denote times at which visual targets could occur. (b) Mean percentage of trials on which participants reported seeing the target on cued side first, as a function of cued-side onset advantage (CSOA; i.e., lead time). Negative CSOAs indicate that uncued-side target was presented first; positive CSOAs indicate that cued-side target was presented first. (c) Grand-average ERPs to simultaneous visual targets, averaged over 79% of trials on which participants indicated that cued-side target appeared first. ERPs were recorded at contralateral and ipsilateral occipital electrodes (PO7/PO8). Statistically significant differences between contralateral and ipsilateral waveforms are denoted in gray on time axis. (d) Scalp topographies of ERP waveforms in time range of P1 (90–120 ms). Left and right sides of the map show electrodes ipsilateral and contralateral electrodes, respectively. (e) Projections of best-fitting dipolar sources onto sections of an average MRI. Dipoles were located in superior temporal lobe (STS) and fusiform gyrus (FG). FG dipoles accounted for cue-induced P1 amplitude modulation, whereas STS dipoles accounted for a long-latency (200–250 ms) negative deflection.

From: Chapter 26, Cross-Modal Spatial Cueing of Attention Influences Visual Perception

Cover of The Neural Bases of Multisensory Processes
The Neural Bases of Multisensory Processes.
Murray MM, Wallace MT, editors.
Boca Raton (FL): CRC Press; 2012.
Copyright © 2012 by Taylor & Francis Group, LLC.

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