Critical flicker frequency and EEG findings in patients with brain damage

Kooi, Kenneth A.; Boswell, Reed S.; Thomas, Madison H.

doi:10.1212/wnl.8.10.764

Cited by 13 publications

(5 citation statements)

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“…We next investigated on 13 participants the potential perceptual consequences of the luminance‐induced alpha modulations in a monocular CFF task that is suggested to be linked with EEG alpha expression (Chyatte, ; Kooi et al ., ; May et al ., ). A linear mixed‐effect model on the CFF timecourse showed a significant effect of time session (fixed effect ‘time session’ with ‘subject’ as random effect.…”

Section: Resultsmentioning

confidence: 98%

“…The critical flicker frequency (CFF) is an index of visual temporal segmentation abilities, revealing basic aspects of our visual temporal resolution. It has been suggested that CFF and alpha activities might correlate (Chyatte, ; Kooi et al ., ; May et al ., ); however, the majority of the reported effects are shown for clinical populations (Karp et al ., ; May et al ., ), rely on somatosensory tasks (May et al ., ), or their results have been questioned (Dondero et al ., ; Karp et al ., ). Recent findings have shown that the alpha frequency is crucial in determining our temporal segmentation abilities (Varela et al ., ; Cecere et al ., ; Samaha & Postle, ; Milton & Pleydell‐Pearce, ), suggesting a possible link between CFF and alpha oscillations.…”

Section: Discussionmentioning

confidence: 98%

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Different responses of spontaneous and stimulus‐related alpha activity to ambient luminance changes

Benedetto

Lozano-Soldevilla

VanRullen

2017

Eur J of Neuroscience

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Alpha oscillations are particularly important in determining our percepts and have been implicated in fundamental brain functions. Oscillatory activity can be spontaneous or stimulus-related. Furthermore, stimulus-related responses can be phase- or non-phase-locked to the stimulus. Non-phase-locked (induced) activity can be identified as the average amplitude changes in response to a stimulation, while phase-locked activity can be measured via reverse-correlation techniques (echo function). However, the mechanisms and the functional roles of these oscillations are far from clear. Here, we investigated the effect of ambient luminance changes, known to dramatically modulate neural oscillations, on spontaneous and stimulus-related alpha. We investigated the effect of ambient luminance on EEG alpha during spontaneous human brain activity at rest (experiment 1) and during visual stimulation (experiment 2). Results show that spontaneous alpha amplitude increased by decreasing ambient luminance, while alpha frequency remained unaffected. In the second experiment, we found that under low-luminance viewing, the stimulus-related alpha amplitude was lower, and its frequency was slightly faster. These effects were evident in the phase-locked part of the alpha response (echo function), but weaker or absent in the induced (non-phase-locked) alpha responses. Finally, we explored the possible behavioural correlates of these modulations in a monocular critical flicker frequency task (experiment 3), finding that dark adaptation in the left eye decreased the temporal threshold of the right eye. Overall, we found that ambient luminance changes impact differently on spontaneous and stimulus-related alpha expression. We suggest that stimulus-related alpha activity is crucial in determining human temporal segmentation abilities.

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Section: Resultsmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Different responses of spontaneous and stimulus‐related alpha activity to ambient luminance changes

Benedetto

Lozano-Soldevilla

VanRullen

2017

Eur J of Neuroscience

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“…Earlier studies suggested that, when brain injury was sustained, there were consequent decreases in overall neurological function and sensitivity [24][25][26]. Yet, in many cases of closed-head injuries, the sensation of hypersensitivity has been noted [17,27].…”

Section: Effect Of Tbi On the Neurosensory Thresholdmentioning

confidence: 99%

Critical flicker frequency and related symptoms in mild traumatic brain injury

Chang¹,

Ciuffreda²,

Kapoor³

2007

Brain Injury

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“…hMT/V5+ is well known for its importance in the analysis of visual motion processing [25]–[27] but its role in CFFt perception needs further clarification. Additional information on the contribution of different cortical areas to CFFt is needed to better understand the pathophysiological mechanisms of altered temporal processing of visual stimuli reported in several neurological disorders [10], [28]–[34].…”

Section: Introductionmentioning

confidence: 99%

Inferior Parietal Lobule Encodes Visual Temporal Resolution Processes Contributing to the Critical Flicker Frequency Threshold in Humans

et al. 2014

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The measurement of the Critical Flicker Frequency threshold is used to study the visual temporal resolution in healthy subjects and in pathological conditions. To better understand the role played by different cortical areas in the Critical Flicker Frequency threshold perception we used continuous Theta Burst Stimulation (cTBS), an inhibitory plasticity-inducing protocol based on repetitive transcranial magnetic stimulation. The Critical Flicker Frequency threshold was measured in twelve healthy subjects before and after cTBS applied over different cortical areas in separate sessions. cTBS over the left inferior parietal lobule altered the Critical Flicker Frequency threshold, whereas cTBS over the left mediotemporal cortex, primary visual cortex and right inferior parietal lobule left the Critical Flicker Frequency threshold unchanged. No statistical difference was found when the red or blue lights were used. Our findings show that left inferior parietal lobule is causally involved in the conscious perception of Critical Flicker Frequency and that Critical Flicker Frequency threshold can be modulated by plasticity-inducing protocols.

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Critical flicker frequency and EEG findings in patients with brain damage

Cited by 13 publications

References 0 publications

Different responses of spontaneous and stimulus‐related alpha activity to ambient luminance changes

Different responses of spontaneous and stimulus‐related alpha activity to ambient luminance changes

Critical flicker frequency and related symptoms in mild traumatic brain injury

Inferior Parietal Lobule Encodes Visual Temporal Resolution Processes Contributing to the Critical Flicker Frequency Threshold in Humans

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