ELEKTROPHYSIOLOGISCHE BEFUNDE BEI FARBSELEKTIONSPROZESSEN

Translated title of the contribution: Electrophysiological findings of color selection processes

S. Johannes, T. F. Munte, George R Mangun

Research output: Contribution to journalArticle

Abstract

In perception, certain criteria have to be used to select and process stimuli prior to conscious recognition. One possible selection criterion is the color of the stimuli. In previous work it has been shown that color and color selection influence visual event-related potentials (ERP). A frontally localized positivity occurring about 200 ms post stimulus and a more widely distributed negativity from 150 to 350 ms post stimulus have been described. We further explored the mechanisms of color selection with the ERP-technique. The specificity of the effects of color selection and the topographical distribution of the effects by means of isovoltage maps were of particular interest. In two experiments the same 8 healthy subjects viewed a randomized order of stimuli appearing in one of two possible colors. The subjects had the task to attend to stimuli of one color while ignoring those of the other color and to press a button whenever a defined target stimulus appeared in the attended color. Between both experiments the physical aspects of the stimuli varied with respect to form and definition of the target stimuli. This allowed a separation of color-specific and color-nonspecific selection processes. Color specific selection processes have to be independent of physical stimulus aspects, while the effects of nonspecific selection processes vary with the experiments. The earliest effects of color selection on the ERP were found from 200 ms after stimulus presentation. While the latency of the frontal P2-component varied significantly between the two experiments, a superimposed frontal positivity in the range from 200 to 250 ms, which did not vary between the two experiments, could be separated. Also, a more widely distributed negativity between 250 and 500 ms post stimulus was found. While the latency and amplitude of the frontal positivity did not vary between the two experiments, the amplitude of the negativity was significantly larger in one experiment than in the other. These findings are interpreted in terms of a color specific frontal positivity, which is also independent of the P2-component and a color nonspecific negativity. The isovoltage maps showed a frontal maximum for the positivity. These results are discussed with respect to the results of other ERP and Positron Emission Tomography (PET) -studies of color selection.

Original languageGerman
Pages (from-to)83-88
Number of pages6
JournalEEG-EMG Zeitschrift fur Elektroenzephalographie Elektromyographie und Verwandte Gebiete
Volume26
Issue number2
StatePublished - 1995
Externally publishedYes

Fingerprint

Color
Evoked Potentials
Positron-Emission Tomography
Patient Selection
Healthy Volunteers

Keywords

  • color
  • event-related potentials
  • selective attention
  • visual

ASJC Scopus subject areas

  • Clinical Neurology

Cite this

ELEKTROPHYSIOLOGISCHE BEFUNDE BEI FARBSELEKTIONSPROZESSEN. / Johannes, S.; Munte, T. F.; Mangun, George R.

In: EEG-EMG Zeitschrift fur Elektroenzephalographie Elektromyographie und Verwandte Gebiete, Vol. 26, No. 2, 1995, p. 83-88.

Research output: Contribution to journalArticle

@article{4a442ec8dcb643f7930fb092c3f7affa,
title = "ELEKTROPHYSIOLOGISCHE BEFUNDE BEI FARBSELEKTIONSPROZESSEN",
abstract = "In perception, certain criteria have to be used to select and process stimuli prior to conscious recognition. One possible selection criterion is the color of the stimuli. In previous work it has been shown that color and color selection influence visual event-related potentials (ERP). A frontally localized positivity occurring about 200 ms post stimulus and a more widely distributed negativity from 150 to 350 ms post stimulus have been described. We further explored the mechanisms of color selection with the ERP-technique. The specificity of the effects of color selection and the topographical distribution of the effects by means of isovoltage maps were of particular interest. In two experiments the same 8 healthy subjects viewed a randomized order of stimuli appearing in one of two possible colors. The subjects had the task to attend to stimuli of one color while ignoring those of the other color and to press a button whenever a defined target stimulus appeared in the attended color. Between both experiments the physical aspects of the stimuli varied with respect to form and definition of the target stimuli. This allowed a separation of color-specific and color-nonspecific selection processes. Color specific selection processes have to be independent of physical stimulus aspects, while the effects of nonspecific selection processes vary with the experiments. The earliest effects of color selection on the ERP were found from 200 ms after stimulus presentation. While the latency of the frontal P2-component varied significantly between the two experiments, a superimposed frontal positivity in the range from 200 to 250 ms, which did not vary between the two experiments, could be separated. Also, a more widely distributed negativity between 250 and 500 ms post stimulus was found. While the latency and amplitude of the frontal positivity did not vary between the two experiments, the amplitude of the negativity was significantly larger in one experiment than in the other. These findings are interpreted in terms of a color specific frontal positivity, which is also independent of the P2-component and a color nonspecific negativity. The isovoltage maps showed a frontal maximum for the positivity. These results are discussed with respect to the results of other ERP and Positron Emission Tomography (PET) -studies of color selection.",
keywords = "color, event-related potentials, selective attention, visual",
author = "S. Johannes and Munte, {T. F.} and Mangun, {George R}",
year = "1995",
language = "German",
volume = "26",
pages = "83--88",
journal = "Klinische Neurophysiologie",
issn = "1434-0275",
publisher = "Georg Thieme Verlag",
number = "2",

}

TY - JOUR

T1 - ELEKTROPHYSIOLOGISCHE BEFUNDE BEI FARBSELEKTIONSPROZESSEN

AU - Johannes, S.

AU - Munte, T. F.

AU - Mangun, George R

PY - 1995

Y1 - 1995

N2 - In perception, certain criteria have to be used to select and process stimuli prior to conscious recognition. One possible selection criterion is the color of the stimuli. In previous work it has been shown that color and color selection influence visual event-related potentials (ERP). A frontally localized positivity occurring about 200 ms post stimulus and a more widely distributed negativity from 150 to 350 ms post stimulus have been described. We further explored the mechanisms of color selection with the ERP-technique. The specificity of the effects of color selection and the topographical distribution of the effects by means of isovoltage maps were of particular interest. In two experiments the same 8 healthy subjects viewed a randomized order of stimuli appearing in one of two possible colors. The subjects had the task to attend to stimuli of one color while ignoring those of the other color and to press a button whenever a defined target stimulus appeared in the attended color. Between both experiments the physical aspects of the stimuli varied with respect to form and definition of the target stimuli. This allowed a separation of color-specific and color-nonspecific selection processes. Color specific selection processes have to be independent of physical stimulus aspects, while the effects of nonspecific selection processes vary with the experiments. The earliest effects of color selection on the ERP were found from 200 ms after stimulus presentation. While the latency of the frontal P2-component varied significantly between the two experiments, a superimposed frontal positivity in the range from 200 to 250 ms, which did not vary between the two experiments, could be separated. Also, a more widely distributed negativity between 250 and 500 ms post stimulus was found. While the latency and amplitude of the frontal positivity did not vary between the two experiments, the amplitude of the negativity was significantly larger in one experiment than in the other. These findings are interpreted in terms of a color specific frontal positivity, which is also independent of the P2-component and a color nonspecific negativity. The isovoltage maps showed a frontal maximum for the positivity. These results are discussed with respect to the results of other ERP and Positron Emission Tomography (PET) -studies of color selection.

AB - In perception, certain criteria have to be used to select and process stimuli prior to conscious recognition. One possible selection criterion is the color of the stimuli. In previous work it has been shown that color and color selection influence visual event-related potentials (ERP). A frontally localized positivity occurring about 200 ms post stimulus and a more widely distributed negativity from 150 to 350 ms post stimulus have been described. We further explored the mechanisms of color selection with the ERP-technique. The specificity of the effects of color selection and the topographical distribution of the effects by means of isovoltage maps were of particular interest. In two experiments the same 8 healthy subjects viewed a randomized order of stimuli appearing in one of two possible colors. The subjects had the task to attend to stimuli of one color while ignoring those of the other color and to press a button whenever a defined target stimulus appeared in the attended color. Between both experiments the physical aspects of the stimuli varied with respect to form and definition of the target stimuli. This allowed a separation of color-specific and color-nonspecific selection processes. Color specific selection processes have to be independent of physical stimulus aspects, while the effects of nonspecific selection processes vary with the experiments. The earliest effects of color selection on the ERP were found from 200 ms after stimulus presentation. While the latency of the frontal P2-component varied significantly between the two experiments, a superimposed frontal positivity in the range from 200 to 250 ms, which did not vary between the two experiments, could be separated. Also, a more widely distributed negativity between 250 and 500 ms post stimulus was found. While the latency and amplitude of the frontal positivity did not vary between the two experiments, the amplitude of the negativity was significantly larger in one experiment than in the other. These findings are interpreted in terms of a color specific frontal positivity, which is also independent of the P2-component and a color nonspecific negativity. The isovoltage maps showed a frontal maximum for the positivity. These results are discussed with respect to the results of other ERP and Positron Emission Tomography (PET) -studies of color selection.

KW - color

KW - event-related potentials

KW - selective attention

KW - visual

UR - http://www.scopus.com/inward/record.url?scp=0029078843&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029078843&partnerID=8YFLogxK

M3 - Article

VL - 26

SP - 83

EP - 88

JO - Klinische Neurophysiologie

JF - Klinische Neurophysiologie

SN - 1434-0275

IS - 2

ER -