EEG early evoked gamma-band synchronization reflects object recognition in visual oddball tasks

Brain Topography
Gábor StefanicsIstván Hernádi

Abstract

EEG was recorded in 3 visual oddball experiments during presentation of natural photos of butterflies and plants in order to study the early gamma activity evoked by familiar and novel stimuli. In all three experiments a picture of one specific butterfly served as the target and the subjects' task was to silently count them. In Experiment 1 neutral stimuli were individual pictures of butterflies from other species, in Experiment 2 neutral stimuli were individual pictures of plants and in Experiment 3 both types of neutral stimuli were applied. Phase-locking factor was computed by complex sinusoid wavelet method. Consistent with other studies, significant phase-locked gamma-synchronization was found at 80-140 ms post stimulus interval in the 20-50 Hz range at parietal and occipital sites in response to the repeating target. Non-target stimuli did not evoke similar activity in the gamma-frequency range. The observed difference can be explained if we assume that the repeated experience of an object may lead to the rapid formation of a neural assembly representing the object causing the repetition priming effect. In our study the single target stimulus was introduced to the subjects before the experiment, whereas individual non-tar...Continue Reading

Citations

Dec 27, 2005·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·David B ChorlianHenri Begleiter
Apr 5, 2011·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Tatiana A StroganovaYuriy V Obukhov
Jan 29, 2021·Scientific Reports·Andrés Canales-JohnsonValdas Noreika

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