Journal
BIOLOGICAL PSYCHOLOGY
Volume 129, Issue -, Pages 16-24Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.biopsycho.2017.07.013
Keywords
Visual mental imagery; Top-down modulation; Face; Vertex positive potential; P2; N170; Event-related potentials
Funding
- 973 National Basic Research Program of China [2015CB351800]
- Beijing Municipal Science & Tech Commission [Z161100002616017]
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Visual mental imagery forms mental representations of visual objects when correspondent stimuli are absent and shares some characters with visual perception. Both the vertex-positive-potential (VPP) and N170 components of event-related potentials (ERPs) to visual stimuli have a remarkable preference to faces. This study investigated whether visual mental imagery modulates the face-sensitive VPP and/or N170 components. The results showed that with significantly larger amplitudes under the face-imagery condition than the house-imagery condition, the VPP and P2 responses, but not the N170 component, were elicited by phase-randomized ambiguous stimuli. Thus, the brain substrates underlying VPP are not completely identical to those underlying N170, and the VPP/P2 manifestation of the category selectivity in imagery probably reflects an integration of top-down mental imagery signals (from the prefrontal cortex) and bottom-up perception signals (from the early visual cortex) in the occipito-temporal cortex where VPP and P2 originate.
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