Event-related oscillations in structural and semantic encoding of faces

Sakihara, Kotoe; Gunji, Atsuko; Furushima, Wakana; Inagaki, Masumi

doi:10.1016/j.clinph.2011.06.023

Cited by 27 publications

(26 citation statements)

References 42 publications

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“…Inverted faces however produced the most alpha enhancement in the right occipitotemporal area, indicating additional attentional requirements and increased synchrony between neuronal populations. Sakihara et al, [49] also found alpha, theta and beta suppression occurring over occipitotemporal areas during familiar, unfamiliar and own face perception. Such activity may illustrate the structural and semantic encoding of facial information [49], [50].…”

Section: Introductionmentioning

confidence: 90%

Event-Related Alpha Suppression in Response to Facial Motion

et al. 2014

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While biological motion refers to both face and body movements, little is known about the visual perception of facial motion. We therefore examined alpha wave suppression as a reduction in power is thought to reflect visual activity, in addition to attentional reorienting and memory processes. Nineteen neurologically healthy adults were tested on their ability to discriminate between successive facial motion captures. These animations exhibited both rigid and non-rigid facial motion, as well as speech expressions. The structural and surface appearance of these facial animations did not differ, thus participants decisions were based solely on differences in facial movements. Upright, orientation-inverted and luminance-inverted facial stimuli were compared. At occipital and parieto-occipital regions, upright facial motion evoked a transient increase in alpha which was then followed by a significant reduction. This finding is discussed in terms of neural efficiency, gating mechanisms and neural synchronization. Moreover, there was no difference in the amount of alpha suppression evoked by each facial stimulus at occipital regions, suggesting early visual processing remains unaffected by manipulation paradigms. However, upright facial motion evoked greater suppression at parieto-occipital sites, and did so in the shortest latency. Increased activity within this region may reflect higher attentional reorienting to natural facial motion but also involvement of areas associated with the visual control of body effectors.

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Section: Introductionmentioning

confidence: 90%

Event-Related Alpha Suppression in Response to Facial Motion

et al. 2014

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“…Based on previous results [48], [52], [54], [81] - which explain the enhanced N170 with increased event-related synchronisation in the theta, alpha and beta range within the 0–200 ms time window, we focused our analysis to this time window. Mean ITC and ERSP time courses, corresponding to the N170 ERP component (130–190 ms post-stimulus onset) were submitted to two-way repeated-measures ANOVA over the P9/P10 electrodes with Stimulus (2; FACE, NOISE) and Hemisphere (2; left and right) as within-subject factors.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, recent results showed that the visual ERPs in the 100–200 ms time window might be explained to a large extent by the partial phase resetting of ongoing activity in a restricted frequency band [51]–[54]. It has also been shown that the phase of the cortical oscillations is in connection with the timing of the neural activity in the animal brain [55], however, the exact role of the oscillatory phase and its synchronization in cortical information processing is under heavy debate in the literature.…”

Section: Introductionmentioning

confidence: 99%

The Background of Reduced Face Specificity of N170 in Congenital Prosopagnosia

et al. 2014

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Congenital prosopagnosia is lifelong face-recognition impairment in the absence of evidence for structural brain damage. To study the neural correlates of congenital prosopagnosia, we measured the face-sensitive N170 component of the event-related potential in three members of the same family (father (56 y), son (25 y) and daughter (22 y)) and in age-matched neurotypical participants (young controls: n = 14; 24.5 y±2.1; old controls: n = 6; 57.3 y±5.4). To compare the face sensitivity of N170 in congenital prosopagnosic and neurotypical participants we measured the event-related potentials for faces and phase-scrambled random noise stimuli. In neurotypicals we found significantly larger N170 amplitude for faces compared to noise stimuli, reflecting normal early face processing. The congenital prosopagnosic participants, by contrast, showed reduced face sensitivity of the N170, and this was due to a larger than normal noise-elicited N170, rather than to a smaller face-elicited N170. Interestingly, single-trial analysis revealed that the lack of face sensitivity in congenital prosopagnosia is related to a larger oscillatory power and phase-locking in the theta frequency-band (4–7 Hz, 130–190 ms) as well as to a lower intertrial jitter of the response latency for the noise stimuli. Altogether, these results suggest that congenital prosopagnosia is due to the deficit of early, structural encoding steps of face perception in filtering between face and non-face stimuli.

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“…Empirical data from previous findings with healthy controls showed that facial feature decoding (Sakihara, Gunji, Furushima, & Inagaki, 2012) and emotion recognition (Balconi & Lucchiari, 2006) were associated with oscillatory activity in the theta band (4-7 Hz) in the 150-200 ms after stimulus presentation. In addition, a study of facial expression processing using MEG (Maratos, Mogg, Bradley, Rippon, & Senior, 2009) found differences in theta oscillations between fearful and neutral faces and proposed that theta oscillations play an important role in integrating activity within emotion-processing networks.…”

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confidence: 97%

Event-related theta synchronization predicts deficit in facial affect recognition in schizophrenia.

Csukly

Stefanics

Komlósi

et al. 2014

Journal of Abnormal Psychology

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Growing evidence suggests that abnormalities in the synchronized oscillatory activity of neurons in schizophrenia may lead to impaired neural activation and temporal coding and thus lead to neurocognitive dysfunctions, such as deficits in facial affect recognition. To gain an insight into the neurobiological processes linked to facial affect recognition, we investigated both induced and evoked oscillatory activity by calculating the Event Related Spectral Perturbation (ERSP) and the Inter Trial Coherence (ITC) during facial affect recognition. Fearful and neutral faces as well as nonface patches were presented to 24 patients with schizophrenia and 24 matched healthy controls while EEG was recorded. The participants' task was to recognize facial expressions. Because previous findings with healthy controls showed that facial feature decoding was associated primarily with oscillatory activity in the theta band, we analyzed ERSP and ITC in this frequency band in the time interval of 140-200 ms, which corresponds to the N170 component. Event-related theta activity and phase-locking to facial expressions, but not to nonface patches, predicted emotion recognition performance in both controls and patients. Event-related changes in theta amplitude and phase-locking were found to be significantly weaker in patients compared with healthy controls, which is in line with previous investigations showing decreased neural synchronization in the low frequency bands in patients with schizophrenia. Neural synchrony is thought to underlie distributed information processing. Our results indicate a less effective functioning in the recognition process of facial features, which may contribute to a less effective social cognition in schizophrenia.

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Event-related oscillations in structural and semantic encoding of faces

Cited by 27 publications

References 42 publications

Event-Related Alpha Suppression in Response to Facial Motion

Event-Related Alpha Suppression in Response to Facial Motion

The Background of Reduced Face Specificity of N170 in Congenital Prosopagnosia

Event-related theta synchronization predicts deficit in facial affect recognition in schizophrenia.

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