Inter-trial effect in luminance processing revealed by magnetoencephalography

Aki Kondo*, Katsumi Watanabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In 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 occipito-temporal 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.

Original languageEnglish
Pages (from-to)1559-1565
Number of pages7
JournalUniversitas Psychologica
Issue number5
Publication statusPublished - 2013
Externally publishedYes


  • Cognitive science
  • Inter-trial effect
  • Luminance
  • Magnetoencephalography (MEG)
  • Occipito-temporal region
  • Perception

ASJC Scopus subject areas

  • General Psychology


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