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Inferior parietal lobule encodes visual temporal resolution processes contributing to the critical flicker frequency threshold in humans.

Nardella A, Rocchi L, Conte A, Bologna M, Suppa A, Berardelli A - PLoS ONE (2014)

Bottom Line: The measurement of the Critical Flicker Frequency threshold is used to study the visual temporal resolution in healthy subjects and in pathological conditions.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.

View Article: PubMed Central - PubMed

Affiliation: IRCCS Neuromed, Pozzilli, Isernia, Italy.

ABSTRACT
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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Related in: MedlinePlus

Changes in static and moving phosphenes thresholds induced by cTBS over occipital and mediotemporal cortex.Changes in static (light gray column) and moving (dark gray column) phosphenes thresholds (PT) induced by cTBS over occipital cortex and mediotemporal cortex, respectively. Each column represents mean value; bars represent SE. Y axis represents stimulation intensity expressed as percentage of maximum stimulator output. X axis represents time points (before and after cTBS)
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pone-0098948-g005: Changes in static and moving phosphenes thresholds induced by cTBS over occipital and mediotemporal cortex.Changes in static (light gray column) and moving (dark gray column) phosphenes thresholds (PT) induced by cTBS over occipital cortex and mediotemporal cortex, respectively. Each column represents mean value; bars represent SE. Y axis represents stimulation intensity expressed as percentage of maximum stimulator output. X axis represents time points (before and after cTBS)

Mentions: Paired sample T test showed that cTBS delivered over V1 significantly increased PT (mean PT pre-cTBS = 53.5 vs. mean PT post-cTBS = 56.2; p = 0.006). cTBS over left hMT/V5+ significantly increased MPT (mean MPT pre-cTBS = 50.7 vs. mean PT post-cTBS = 56.6; p<0.01) (Figure 5).


Inferior parietal lobule encodes visual temporal resolution processes contributing to the critical flicker frequency threshold in humans.

Nardella A, Rocchi L, Conte A, Bologna M, Suppa A, Berardelli A - PLoS ONE (2014)

Changes in static and moving phosphenes thresholds induced by cTBS over occipital and mediotemporal cortex.Changes in static (light gray column) and moving (dark gray column) phosphenes thresholds (PT) induced by cTBS over occipital cortex and mediotemporal cortex, respectively. Each column represents mean value; bars represent SE. Y axis represents stimulation intensity expressed as percentage of maximum stimulator output. X axis represents time points (before and after cTBS)
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4048231&req=5

pone-0098948-g005: Changes in static and moving phosphenes thresholds induced by cTBS over occipital and mediotemporal cortex.Changes in static (light gray column) and moving (dark gray column) phosphenes thresholds (PT) induced by cTBS over occipital cortex and mediotemporal cortex, respectively. Each column represents mean value; bars represent SE. Y axis represents stimulation intensity expressed as percentage of maximum stimulator output. X axis represents time points (before and after cTBS)
Mentions: Paired sample T test showed that cTBS delivered over V1 significantly increased PT (mean PT pre-cTBS = 53.5 vs. mean PT post-cTBS = 56.2; p = 0.006). cTBS over left hMT/V5+ significantly increased MPT (mean MPT pre-cTBS = 50.7 vs. mean PT post-cTBS = 56.6; p<0.01) (Figure 5).

Bottom Line: The measurement of the Critical Flicker Frequency threshold is used to study the visual temporal resolution in healthy subjects and in pathological conditions.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.

View Article: PubMed Central - PubMed

Affiliation: IRCCS Neuromed, Pozzilli, Isernia, Italy.

ABSTRACT
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.

Show MeSH
Related in: MedlinePlus