The aim of this study was to explore the relationship between electroencephalographic (EEG) activity in the gamma frequency range and conscious awareness of a visual stimulus. EEG was recorded from subjects while they were shown backward-masked words only some of which they were able to discriminate correctly. The results showed that activity in the gamma frequency range increase with reported awareness of a word independently of whether it was correctly discriminated or not. It is concluded that gamma power is associated with awareness-dependent visual processing but not with processing that occurs in the absence of awareness.
- gamma oscillations
- pattern masking
- subjective reports
Summerfield, C., Jack, A. I., & Burgess, A. P. (2002). Induced gamma activity is associated with conscious awareness of pattern masked nouns. International Journal of Psychophysiology, 44(2), 93-100. https://doi.org/10.1016/S0167-8760(02)00003-X