Selective attention modulates the temporal window of integration

Sharp, Poppy; Melcher, David; Hickey, Clayton

doi:10.1167/17.10.1319

Cited by 1 publication

(1 citation statement)

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“…Endogenous alpha IF changes have been linked to visual task demands (Sharp, 2019;Wutz et al, 2018), with an increase in frequency corresponding to a demand in segregating visual information in time (versus integrating). We can therefore speculate that following a saccade, the non-visually mediated increase in alpha IF may reflect an increase in the temporal resolution of the visual system, facilitating the detection of visual changes in order to accelerate the processing of the incoming visual information.…”

Section: General Discussion and Conclusionmentioning

confidence: 99%

Changes in neural activity around the time of saccades: Separate contributions of visual and non-visual signals on MEG alpha and theta band activity

Acunzo¹,

Melcher²

2021

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Visual processing mainly occurs during fixation, periods separated by saccadic eye movements, necessitating a close coordination between sensory and motor systems. It has been suggested that the intention to make a saccade can modulate neural activity, including predictive changes, suppression of peri-saccadic retinal input and trans-saccadic integration. Consistent with this idea, modulations of neural activity around the time of saccades have been reported in non-human species, showing non-visually mediated, extraretinal responses in specific brain regions. In humans, however, peri-saccadic whole-brain activity has mainly been studied in the context of a perceptual task, making it difficult to disentangle activity related to the task, visual transients from retinal stimulation and non-visual (saccade-related) responses. We measured magnetoencephalography (MEG) theta (3–7 Hz) and alpha (8–12 Hz) activity during voluntary horizontal saccade execution between two fixation points. To distinguish between visually and non-visually mediated activity, participants engaged in three tasks: voluntary saccades in near-darkness, fixation with visual input shifted to simulate the saccade, and volitional saccades in total darkness. Using correlational analyses, we found that patterns of neural activity are consistent with contributions of two separate mechanisms, one related to saccades (non-visual/extraretinal) and the other linked to the processing of visual input at the beginning of the new fixation (visual/retinal). Changes in occipital alpha power and instantaneous frequency showed a similar time course in near-dark and simulated saccade conditions, suggesting an effect of visually evoked responses. In contrast, alterations in parietal-occipital theta power and phase clustering were consistent with a non-visually-driven (extraretinal) mechanism, with similar multivariate patterns for near-dark and full-darkness conditions. Some effects, such as theta phase reset and alterations in alpha power, showed separable contributions of both the saccade and visual transient, with differing time courses. This combination of visual and non-visual mechanisms may support sensorimotor integration during active vision.

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Section: General Discussion and Conclusionmentioning

confidence: 99%