The present study examined the interaction between spatial attention and gl
obal/local feature processing of visual hierarchical stimuli. Event-related
brain potentials (ERPs) were recorded from subjects who detected global or
local targets at attended locations while ignoring those at unattended loc
ations. Spatial attention produced enhanced occipital P1 and N1 waves in bo
th global and local conditions. Selection of local features enhanced poster
ior P1, N1 and N2 waves relative to selection of global features. However,
the modulations of the P1 and N2 by global/local feature selection were str
onger when spatial attention was directed to the left than the right visual
fields. The results suggest neurophysiological bases for interactions betw
een spatial attention and hierarchical analysis at multiple stages of visua
l processing. NeuroReport 11:2753-2758 (C) 2000 Lippincott Williams & Wilki
ns.