Face perception in humans

Face perception in humans Ryusuke Kakigi Department of Integrative Physiology National Institute for Physiological Sciences, Okazaki, Japan Many things look like a face Important regions for face perception A: Primary visual cortex (V1), B: Fusiform gyrus C: MT/V5, D: Superior temporal sulcus (STS), E: Amygdala fMRI in patients with prosopagnosia who cannot recognize faces Fusiform gyrus is activated to face in a normal subject (NH), but no response in patients with prosopagnosia (AV, GA, RP) Important regions for face perception A: Primary visual cortex (V1), B: Fusiform gyrus C: MT/V5, D: Superior temporal sulcus (STS), E: Amygdala Amygdala is important to recognize face expression Amygdala is activated to face expression, in particular, to fearful and sad faces Analysis of face-specific component (N170) At years old, Amplitude is very large, particularly to Eyes No significant difference Between upright and inverted Analysis of face-specific component (N170) At 10 years old, N170 showed double peaks, but such s phenomenon disappeared at 14 years old Analysis of face-specific component (N170) At 14 years old, N170 was almost the same as that in adults Analysis of face-specific component (N170) Waveform changes at 6, 8, 10, 12, and 14 years old Face perception and recognition MEG responses elicited by viewing static faces and eyes Development of face perception and recognition Face inversion effect Subliminal effect on face perception Subliminal effect on face perception Face, Letter, Dots and Star are shown for a short period in the video of rotating pot Three different durations of intermittent stimuli Subthreshold : 16 msec Subjects cannot see it (subliminal) Intermediate: 32 msec Subjects can see something, but cannot determine what it is Suprathreshold: 48 msec Subjects can see what it is Notice: Due to a limitation of time resolution of PowerPoint, the video moves much slower than the real speed, at about a half EEG study New methods for subliminal stimulation COS: Color-opponent subliminal stimulation using red, green and yellow ６ Hz Hoshiyama et al.: Human Brain Mapping, 2006 100 Hz Hoshiyama et al.: Human Brain mapping, 2006 100-Hz stimuli  We cannot see the face at 100 Hz, but face information reaches the visual cortex (Subliminal stimuli)  We are now studying face perception using these unique subliminal stimuli, but the results are complicated  Please read our papers to know the detailed results Hoshiyama M, Kakigi R: Human Brain Mapping 2006, Neurosci Lett 2006 Collaborators NIPS Shoko Watanabe, Kensaku Miki Yukiko Honda, Emi Tanaka Nagoya University Minoru Hoshiyama West Virginia University Aina Puce Chuo University Yumiko Otsuka, Emi Nakato, Megumi Kobayashi, Masami Yamaguchi Thank you very much for your attention Members of my department ... static faces and eyes Development of face perception and recognition Face inversion effect Subliminal effect on face perception Face perception in infants using near-infrared spectroscopy (NIRS) ... EEG responses elicited by viewing static faces and eyes Development of face perception and recognition Face inversion effect Subliminal effect on face perception Face specific EEG component (MEG... Face perception and recognition MEG and EEG responses elicited by viewing static faces and eyes Development of face perception and recognition Face inversion effect Subliminal effect on face perception