Slow cortical potential shifts modulate the sensory threshold in human visual system.
Neurosci Lett
; 270(1): 17-20, 1999 Jul 23.
Article
em En
| MEDLINE
| ID: mdl-10454135
ABSTRACT
The relationship between the spontaneous slow cortical potential shifts and the detection of visual stimuli at sensory threshold were investigated. The mean slow cortical potentials preceding the detected stimuli were more negative than those preceding the missed stimuli. Accordingly, the stimulus detection performance was higher during negative compared to positive cortical potential shifts. These findings demonstrate that the cortical negativity reflects increased excitability of neural networks, thereby facilitates the detection of threshold stimuli, in contrast to cortical positivity. Therefore, at near-threshold stimulus intensities one reason for detecting the stimulus in one trial but missing it in another could be the change in the EEG baseline between the trials.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Limiar Sensorial
/
Percepção Visual
/
Mapeamento Encefálico
/
Córtex Cerebral
/
Potenciais Evocados Visuais
Limite:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Neurosci Lett
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Turquia