Subjects: Psychology >> Developmental Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Since the introduction of the time-frequency analysis technique into the field of EEG data in the 1980’s, researchers can excavate non-phase locked components in EEG signals, overcoming the previous shortcomings of traditional ERP methods. In the field of psychology, the two most commonly used time-frequency analysis methods are wavelet transform and Hilbert transform. Power, phase locking index (PLI), and coherence are three important indices of time-frequency analysis. Power in different frequency band is typically considered to reflect different mental processes. For example, α power is frequently related to selective attention, while γ energy is often associated with feature binding. Researchers use PLI to investigate the mechanism generated by an ERP component. Coherence indicates the exchange of information between long-distance brain regions and cognitive control of higher-level brain regions in the low-level brain regions, which show different patterns in various complex cognitive tasks.
Subjects: Psychology >> Developmental Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Human perception to near-threshold visual stimuli is not always reliable. To investigate variability of visual perception and its neural mechanism, some researchers focus on the influences of prestimulus ongoing alpha oscillations (8~13 Hz) on visual perception. Recently, studies found that decrease of prestimulus alpha power associated with improvement of observers’ detection rate, but no such effect on perception accuracy was found. In addition, phase of prestimulus alpha was reported to predict whether an observer can detect the following visual stimulus or not. Thus, power of prestimulus alpha is considered to reflect the excitability of visual cortex; decrease of alpha power indicates increase of cortical excitability, which results in higher detection rate of near-threshold stimuli. Nevertheless, phase of prestimulus alpha might play a role in regulating the time of excitation and inhibition of the cortex, and the different brain states (excitation or inhibition) at stimulus onset would lead to different perceptions of the stimulus.
Subjects: Psychology >> Cognitive Psychology submitted time 2020-01-14
Abstract： Human perception to near-threshold visual stimuli is not always reliable. To investigate variability of visual perception and its neural mechanism, some researchers focus on the influences of prestimulus ongoing alpha oscillations (8~13 Hz) on visual perception. Recently, studies found that decrease of prestimulus alpha power associated with improvement of observers’ detection rate, but no such effect on perception accuracy was found. In addition, phase of prestimulus alpha was reported to predict whether an observer can detect the following visual stimulus or not. Thus, power of prestimulus alpha is considered to reflect the excitability of visual cortex; decrease of alpha power indicates increase of cortical excitability, which results in higher detection rate of near-threshold stimuli. Nevertheless, phase of prestimulus alpha might play a role in regulating the time of excitation and inhibition of the cortex, and the different brain states (excitation or inhibition) at stimulus onset would lead to different perceptions of the stimulus.
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