Lateralized readiness potentials reveal motor slowing in the aging brain.
J Gerontol B Psychol Sci Soc Sci
; 62(2): P78-84, 2007 Mar.
Article
em En
| MEDLINE
| ID: mdl-17379675
ABSTRACT
Older adults consistently show slower reaction times (RTs) to the onset of motion. Both cognitive slowing and motor slowing have been suggested as causes of this effect. The lateralized readiness potential (LRP) of the electroencephalogram can be used to separate perceptual and decision processes from motor programming and execution as causes of RT differences. We used the LRP to discern the origin of slowing in RT to motion onset that occurs in elderly individuals. After the onset of motion in a visual display, we asked participants to identify the direction of that motion (up or down) by pressing a button. Older participants showed significantly slower RTs than did younger participants. The LRP showed that the bulk of slowed response arose from slowed motor processes, rather than perceptual processing. We discuss the differences found in amplitude and onset latency of the LRP in the context of theories of motion processing and inhibition in the aging brain.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Encéfalo
/
Envelhecimento
/
Variação Contingente Negativa
/
Lateralidade Funcional
Limite:
Adolescent
/
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Gerontol B Psychol Sci Soc Sci
Assunto da revista:
CIENCIAS SOCIAIS
/
GERIATRIA
/
PSICOLOGIA
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Canadá