Position-specificity of facial adaptation.
We investigated the representation of objects' position at the higher, shape-selective stages of visual processing by testing the position-specificity of the behavioural and neural effects of facial adaptation. Here, we show that facial after-effects evoked by adaptation to both upright and upside-down faces are significantly larger when the adaptor and test faces are presented on the same retinal position than when they are displayed in different hemifields. Our event-related potential recordings revealed that adaptation effects measured on the amplitude of the N170 event-related potential component over the hemisphere that was contralateral to the test face stimulus also show strong position-specificity. These findings suggest that face adaptation effects are only partially translation invariant and facial after-effects measured with peripheral test stimuli primarily reflect the adaptation processes in the contralateral hemisphere.
Kovács
Gyula
G
Department of Cognitive Science, Budapest University of Technology and Economics, Hungary. gkovacs@cogsci.bme.hu
Zimmer
Márta
M
Harza
Irén
I
Antal
Andrea
A
Vidnyánszky
Zoltán
Z
D000222:Adaptation, Physiological / Q000502:physiology*; D000328:Adult; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005145:Face; D005260:Female; D006801:Humans; D009949:Orientation / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation