Electrophysiological correlates of gist perception: a steady-state visually evoked potentials study

Gist perception refers to perceiving the substance or general meaning of a scene. To investigate its neuronal mechanisms, we used the steady-state visually evoked potential (SSVEP) method—an evoked oscillatory cortical response at the same frequency as a visual stimulus flickered at this frequency....

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Veröffentlicht in:Experimental brain research Jg. 238; H. 6; S. 1399 - 1410
Hauptverfasser: Radtke, Elise L., Schöne, Benjamin, Martens, Ulla, Gruber, Thomas
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2020
Springer Nature B.V
Schlagworte:
Adult
Biomedical and Life Sciences
Biomedicine
Brain
Brain research
Brain Waves - physiology
EEG
Electroencephalography
Electroencephalography - methods
Evoked Potentials, Visual - physiology
Evoked responses
Humans
Information processing
Neurology
Neurosciences
Oscillations
Parietal lobe
Pattern Recognition, Visual - physiology
Perception
Perceptions
Photic Stimulation
Research Article
Semantics
Stimuli
Stimulus
Visual stimuli
Young Adult
Intermodulation frequency
EEG
Steady-state visually evoked potentials
Multi-stimulus displays
Gist perception
ISSN:0014-4819, 1432-1106, 1432-1106
Online-Zugang:Volltext
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Beschreibung
Zusammenfassung:Gist perception refers to perceiving the substance or general meaning of a scene. To investigate its neuronal mechanisms, we used the steady-state visually evoked potential (SSVEP) method—an evoked oscillatory cortical response at the same frequency as a visual stimulus flickered at this frequency. Two neighboring stimuli were flickered at different frequencies f 1 and f 2 , for example, a drawing of a sun on the left side of the screen flickering at 8.6 Hz and the drawing of a parasol on the right side of the screen flickering at 12 Hz. SSVEPs enabled us to separate the responses to the two distinct stimuli by extracting oscillatory brain responses at f 1 and f 2 . Additionally, it allowed to investigate intermodulation frequencies, that is, the brain’s response at a linear combination of f 1 and f 2 (here at f 1  +  f 2  = 20.6 Hz) as an indicator of processing shared aspects of the input, that is, gist perception (here: a beach scene). We recorded high-density EEG of 18 participants. Results revealed clear and separable neuronal oscillations at f 1 and f 2 . Additionally, occipital electrodes showed increased amplitudes at the intermodulation frequency in related as compared to unrelated pairs. The increase in intermodulation frequency was associated with bilateral temporal and parietal lobe activation, probably reflecting the interaction of local object representations as a basis for activating the gist network. The study demonstrates that SSVEPs are an excellent method to unravel mechanisms underlying the processing within multi-stimulus displays in the context of gist perception.
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Communicated by Melvyn A. Goodale.
ISSN:0014-4819
1432-1106
1432-1106
DOI:10.1007/s00221-020-05819-6