The P4pc: an electrophysiological marker of attentional disengagement?
Int J Psychophysiol
; 81(2): 72-81, 2011 Aug.
Article
en En
| MEDLINE
| ID: mdl-21664936
ABSTRACT
The processing of successive targets requires that attention be engaged and disengaged. Whereas attentional engagement can be studied by means of the N2pc component of the event-related potential (ERP), no ERP component has been linked to attentional disengagement. Here, we report the finding of such a component using an RSVP paradigm with multiple, successive targets and with a spatial-cuing paradigm. In both experiments, disengagement of attention was necessary to attend to subsequent targets. A distinct waveform following the N2pc, which we call the P4pc (Positivity 400 ms post-target posterior contralateral), was found. The P4pc was found when a lateralized cue indicated that attention would be needed for the processing of a target at either the same or a different location as the cue, but not when only the cue was to be responded to, indicating that the need to disengage attention is a prerequisite for the P4pc to occur. We expect the P4pc to provide a valuable addition to the set of electrophysiological measures used to study the dynamics and mechanisms of visual attention and visual search.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Atención
/
Potenciales Evocados Visuales
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Int J Psychophysiol
Año:
2011
Tipo del documento:
Article
País de afiliación:
Países Bajos