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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Temporal dynamics of divided spatial attention.

Sirawaj Itthipuripat¹, Javier O Garcia, John T Serences

¹Neurosciences Graduate Program, University of California, San Diego, La Jolla, CA 92093, USA. Itthipuripat.Sirawaj@gmail.com

Journal of Neurophysiology

|February 8, 2013

Summary

This summary is machine-generated.

Dividing spatial attention across noncontiguous objects is possible, even when closely spaced. This division appears to be a discrete process, not gradual, as shown by steady-state visual evoked potentials (SSVEPs).

Keywords:

attention decision making electroencephalography steady-state visual evoked potentials

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Area of Science:

Cognitive Neuroscience
Visual Attention Research

Background:

Observers often monitor multiple objects in naturalistic settings.
The capacity for divided spatial attention across noncontiguous objects, especially when close, remains debated.
Temporal dynamics of attention division (gradual vs. discrete) are unclear.

Purpose of the Study:

Investigate the division of spatial attention across noncontiguous targets.
Clarify the temporal dynamics of attention division.
Relate neurophysiological measures of attention to behavioral performance.

Main Methods:

Recorded steady-state visual evoked potentials (SSVEPs) from subjects monitoring two flickering targets and one distractor.
Stimuli were clustered within a single visual quadrant.
Measured SSVEP power at target and distractor frequencies over time.

Main Results:

Observed a discrete increase in SSVEP power for targets versus distractors prior to correct responses (350-150 ms before response).
SSVEP power divergence suggests spatial attention can be divided across closely spaced, noncontiguous locations.
Evidence indicates attention division is discrete, not continuous.

Conclusions:

Spatial attention can be divided across noncontiguous locations, even within close proximity.
The process of dividing spatial attention appears to be discrete.
SSVEP power is a valid neurophysiological measure related to cognitive function in divided attention tasks.