Limits...
Neural Differences between Covert and Overt Attention Studied using EEG with Simultaneous Remote Eye Tracking

View Article: PubMed Central - PubMed

ABSTRACT

Research on neural mechanisms of attention has generally instructed subjects to direct attention covertly while maintaining a fixed gaze. This study combined simultaneous eye tracking and electroencephalogram (EEG) to measure neural attention responses during exogenous cueing in overt attention shifts (with saccadic eye movements to a target) and compared these with covert attention shifts (responding manually while maintaining central fixation). EEG analysis of the period preceding the saccade latency showed similar occipital response amplitudes for overt and covert shifts, although response latencies differed. However, a frontal positivity was greater during covert attention shifts, possibly reflecting saccade inhibition to maintain fixation. The results show that combined EEG and eye tracking can be successfully used to study natural overt shifts of attention (applicable to non-verbal infants) and that requiring inhibition of saccades can lead to additional frontal responses. Such data can be used to refine current neural models of attention that have been mainly based on covert shifts.

No MeSH data available.


Related in: MedlinePlus

Wave plot of the prefrontal response for manual response conditions in the left hemisphere (left) and the right hemisphere (right) of the brain.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5120114&req=5

Figure 8: Wave plot of the prefrontal response for manual response conditions in the left hemisphere (left) and the right hemisphere (right) of the brain.

Mentions: Prefrontal peak amplitudes (Figures 7, 8), measured as the maximum potential measured in the prefrontal electrode cluster, showed a significant effect of number of targets, F(1,330) = 5.74, p = 0.017, with smaller amplitudes to single (M = 0.842, SD = 2.56) than to double targets (M = 1.49, SD = 3.30), of response type, F(1,330) = 17.71, p < 0.001, with smaller amplitudes for saccades (M = 0.597, SD = 3.12) than for manual responses (M = 1.74, SD = 2.69). There was an interaction effect of target number, brain hemisphere and response type, F(1,330) = 3.91, p = 0.049, Figure 9. No other main effects or interactions were significant.


Neural Differences between Covert and Overt Attention Studied using EEG with Simultaneous Remote Eye Tracking
Wave plot of the prefrontal response for manual response conditions in the left hemisphere (left) and the right hemisphere (right) of the brain.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120114&req=5

Figure 8: Wave plot of the prefrontal response for manual response conditions in the left hemisphere (left) and the right hemisphere (right) of the brain.
Mentions: Prefrontal peak amplitudes (Figures 7, 8), measured as the maximum potential measured in the prefrontal electrode cluster, showed a significant effect of number of targets, F(1,330) = 5.74, p = 0.017, with smaller amplitudes to single (M = 0.842, SD = 2.56) than to double targets (M = 1.49, SD = 3.30), of response type, F(1,330) = 17.71, p < 0.001, with smaller amplitudes for saccades (M = 0.597, SD = 3.12) than for manual responses (M = 1.74, SD = 2.69). There was an interaction effect of target number, brain hemisphere and response type, F(1,330) = 3.91, p = 0.049, Figure 9. No other main effects or interactions were significant.

View Article: PubMed Central - PubMed

ABSTRACT

Research on neural mechanisms of attention has generally instructed subjects to direct attention covertly while maintaining a fixed gaze. This study combined simultaneous eye tracking and electroencephalogram (EEG) to measure neural attention responses during exogenous cueing in overt attention shifts (with saccadic eye movements to a target) and compared these with covert attention shifts (responding manually while maintaining central fixation). EEG analysis of the period preceding the saccade latency showed similar occipital response amplitudes for overt and covert shifts, although response latencies differed. However, a frontal positivity was greater during covert attention shifts, possibly reflecting saccade inhibition to maintain fixation. The results show that combined EEG and eye tracking can be successfully used to study natural overt shifts of attention (applicable to non-verbal infants) and that requiring inhibition of saccades can lead to additional frontal responses. Such data can be used to refine current neural models of attention that have been mainly based on covert shifts.

No MeSH data available.


Related in: MedlinePlus