RT Journal Article
T1 Vertical asymmetries in pre-attentive detection of changes in motion direction
A1 Amenedo Losada, María Elena
A1 Pazo Álvarez, Paula
A1 Cadaveira Mahía, Fernando
K1 Visual evoked potentials
K1 Motion-direction changes
K1 vMMN
K1 Upper/lower hemifield stimulation
AB Stimulus localization affects visual motion processing. Vertical asymmetries favouring lower visual field have been reported in event-related potentials (ERPs) and behavioural studies under different attention conditions. However, there are no studies examining such asymmetries to non attended motion changes. The present study investigated whether the asymmetry in processing information from the upper and lower visual fields also affects the automatic detection of motion-direction changes as indexed by visual Mismatch Negativity (vMMN). We recorded vMMN tochanges in sinusoidal gratings differing in motion direction presented in the periphery of visual field in three different locations: upper and lower (ULVF), upper (UVF) and lower (LVF) along the vertical meridian. The N2 component elicited to peripheral motion presented lower amplitudeswhen the UVF was stimulated. The vMMN elicited to infrequent motion-direction changes was present in all stimulation conditions. However, it was reduced to UVF stimulation. These results suggest that the visual system automatically detects motion-direction changes presented at bothupper–lower visual fields; however they also indicate that the process is favoured when stimuli are presented in the LVF alone.
PB Elsevier
SN 0167-8760
YR 2007
FD 2007
LK http://hdl.handle.net/10347/23244
UL http://hdl.handle.net/10347/23244
LA eng
NO Amenedo, E., Pazo-Alvarez, P., Cadaveira, F. (2007). Vertical asymmetries in pre-attentive detection of changes in motion direction. International Journal of Psychophysiology, 64, 184-189. doi: 10.1016/j.ijpsycho.2007.02.001
NO Study supported by Spanish Ministerio de Ciencia y Tecnología (grant SEJ2004-01377) and by the Galician Secretaría Xeral de I+D (grant PGIDIT05PXIC21101PN)
DS Minerva
RD 30 abr 2026