6533b7d2fe1ef96bd125f571
RESEARCH PRODUCT
Timing of right parietal and frontal cortex activity in visuo-spatial perception: A TMS study in normal individuals
Edoardo BisiachFilippo BrighinaAurelio PiazzaBrigida FierroMassimiliano Oliverisubject
Adultgenetic structuresmedicine.medical_treatmentmedia_common.quotation_subjectPosterior parietal cortexStimulus (physiology)Electroencephalographybehavioral disciplines and activitiesPerceptual DisordersMagneticsParietal LobemedicineReaction TimeHumansmedia_commonAgedAnalysis of Variancemedicine.diagnostic_testGeneral NeuroscienceCognitionSpatial cognitionMiddle AgedMagnetic Resonance ImagingElectric StimulationFrontal LobeTranscranial magnetic stimulationSpace PerceptionLateralityPsychologyNeurosciencepsychological phenomena and processesPhotic StimulationVigilance (psychology)description
In a recent study we showed that repetitive transcranial magnetic stimulation (rTMS) with train duration of 400 ms over right frontal and right posterior parietal cortices gives rise to transitory contralateral visuo-spatial neglect in normal subjects. In the present experiment we investigated whether using single-pulse TMS it is possible to obtain information about the timing of cortical activity related to spatial cognition. Nine healthy subjects performed in baseline condition and during TMS a tachistoscopic task, requiring a forced-choice estimation of the length of the two segments of prebisected horizontal lines. Single-pulse TMS was triggered at various time intervals (150 ms, 225 ms, 300 ms) after visual stimulus onset with a focal coil over P6 and F4 (according to 10/20 EEG system). Relative transitory rightward bias was observed only when parietal TMS was delivered 150 ms after visual stimulus presentation. Frontal stimulation induced no effect on visuo-spatial perception with the time intervals explored.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-08-01 |