Neuromagnetic Correlates of Perceived Brightness in Human Visual Cortex

Kondo, Atsushi; Tsubomi, Hiroyuki; Watanabe, Katsumi

doi:10.2117/psysoc.2010.267

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The rotating sphere consisted of 200 dots. The basic experimental setting was identical with a previously published article (Kondo et al 2010). There were 18 trials (3 [stimulus type] 9 2 [stimuli presentation type] 9 3 repetition) for each participants.…”

Section: Methodsmentioning

confidence: 99%

Switch or stay? Automatic classification of internal mental states in bistable perception

et al. 2019

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The human brain goes through numerous cognitive states, most of these being hidden or implicit while performing a task, and understanding them is of great practical importance. However, identifying internal mental states is quite challenging as these states are difficult to label, usually short-lived, and generally, overlap with other tasks. One such problem pertains to bistable perception, which we consider to consist of two internal mental states, namely, transition and maintenance. The transition state is short-lived and represents a change in perception while the maintenance state is comparatively longer and represents a stable perception. In this study, we proposed a novel approach for characterizing the duration of transition and maintenance states and classified them from the neuromagnetic brain responses. Participants were presented with various types of ambiguous visual stimuli on which they indicated the moments of perceptual switches, while their magnetoencephalogram (MEG) data were recorded. We extracted different spatio-temporal features based on wavelet transform, and classified transition and maintenance states on a trial-by-trial basis. We obtained a classification accuracy of 79.58% and 78.40% using SVM and ANN classifiers, respectively. Next, we investigated the temporal fluctuations of these internal mental representations as captured by our classifier model and found that the accuracy showed a decreasing trend as the maintenance state was moved towards the next transition state. Further, to identify the neural sources corresponding to these internal mental states, we performed source analysis on MEG signals. We observed the involvement of sources from the parietal lobe, occipital lobe, and cerebellum in distinguishing transition and maintenance states. Cross-conditional classification analysis established generalization potential of wavelet features. Altogether, this study presents an automatic classification of endogenous mental states involved in bistable perception by establishing brain-behavior relationships at the single-trial level.

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Section: Methodsmentioning

confidence: 99%

Switch or stay? Automatic classification of internal mental states in bistable perception

et al. 2019

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Inter-trial effect in luminance processing revealed by Magnetoencephalography

Kondo

Watanabe

2013

Univ Psychol

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A b s t r A c tIn this study, we examined whether luminance processing in the human visual system would exhibit any history effect (i.e., inter-trial modulation) in psychophysical and magnetoencephalographic experiments. A disk was presented against a black background at various luminance levels in a randomized order. During the MEG recording, participants were instructed to rate the brightness of the disk (magnitude estimation) and to report it aloud during inter-stimulus interval. The MEG results showed that the neuromagnetic activation around 200-220 ms after the stimulus onset in the left occipitotemporal regions at a given trial was weaker when the disk luminance in the immediately prior trial was higher. An inverse inter-trial effect was also observed in the psychophysical experiment. These findings suggest that the neuromagnetic activity reflects the inter-trial modulation of luminance processing that correlates with the subjective perception of brightness. Keywords authors luminance, inter-trial effect, magnetoencephalography (MEG). Keywords plusPerception, occipito-temporal region, Cognitive Science. r e s u m e n En este estudio, se examinó si el procesamiento de iluminación en el sistema visual humano exhibie algún efecto de historia (es decir, modulación interensayo) en experimentos psicofísicos y de magnetoencefalografía (MEG). Un disco se presentó contra un fondo negro en varios niveles de iluminación en un orden aleatorio. Durante el registro de MEG, los participantes fueron instruidos para clasificar el brillo del disco (estimación de magnitud) y reportarlo durante el intervalo inter-ensayo. Los resultados de MEG mostraron que la activación neuromagnetica alrededor 200-220 ms después de la aparición de estímulo en las regiones occipito-temporal izquierda en un ensayo dade fue más débil cuando la iluminación de disco en el ensayo inmediatamente antes fue mayor. También se observó un efecto inverso inter-ensayo en el experimento psicofísico. Estos hallazgos sugieren que la actividad neuromagnética refleja la modulación inter-ensayo de procesamiento de iluminación que se correlaciona con la percepción subjetiva de brillo. Palabras clave autoresIluminación, efecto inter-ensayo, magnetoencefalografía (MEG). Palabras clave descriptoresPercepción, región occipito-temporal, ciencia cognitiva.

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Neuromagnetic Correlates of Perceived Brightness in Human Visual Cortex

Cited by 2 publications

References 17 publications

Switch or stay? Automatic classification of internal mental states in bistable perception

Switch or stay? Automatic classification of internal mental states in bistable perception

Inter-trial effect in luminance processing revealed by Magnetoencephalography

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