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Differential age-related changes in N170 responses to upright faces, inverted faces, and eyes in Japanese children

2015.5. 1 PressRelease

Kensaku Miki, Yukiko Honda, Yasuyuki Takeshima, Shoko Watanabe, Ryusuke Kakigi

Abstract

The main objectives of this study were to investigate the development of face perception in Japanese children, focusing on the changes in face processing strategies (holistic and/or configural vs. feature-based) that occur during childhood.  To achieve this, we analyzed the face-related N170 component, evoked by upright face, inverted face, and eyes stimuli in 82 Japanese children aged between 8- and 13-years-old (Fig. 1)
   Figure 2 shows the grand-averaged waveforms obtained with the upright face stimuli by the T6 electrode (right hemisphere) in each age group (8-13-year-olds).  The N170 signals observed after the presentation of the upright face stimuli were longer in duration and/or had at least two peaks in the 8-11-year-old children, whereas those seen in the 12-13-year-old children were sharp and only had a single peak.  Figure 3 shows the grand-averaged waveforms recorded for the 8- to 13-year-old children in each stimulus condition (upright face, inverted face, or eyes) by the T5 (left hemisphere) and T6 (right hemisphere) electrodes.  N170 latency was significantly longer after the presentation of the eyes stimuli than after the presentation of the upright face stimuli in the 10- and 12-year-old children.  In addition, significant differences in N170 latency were observed among all three stimulus types in the 13-year-old children.  N170 amplitude was significantly greater after the presentation of the eyes stimuli than after the presentation of the upright face stimuli in the 8-10- and 12-year-old children.
   The results of the present study indicate that the upright face stimuli were processed using holistic and/or configural processing by the 13-year-old children.

Keywords

N170, face, development, EEG, eyes, inversion

Figure 1: Examples of the stimuli and other images used in this study

 (1) Upright face: images of a neutral face; (2) Inverted face: inverted versions of the upright face stimuli; (3) Eyes: images showings eyes alone without facial contours or other features.

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Figure 2: Grand-averaged waveforms recorded at the T6 (right hemisphere) electrode in response to the upright face stimuli

N170 was a large negative deflection between 150-250 ms for all ages in this figure. The large negative deflection (N170) was longer in duration and/or had at least two peaks in the 8-11-year-old children, whereas it was sharp and had one peak in the 12-13-year-old children.  The black arrows indicate the abovementioned peaks.

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Figure 3: Differences in grand-averaged waveforms recorded at the T5 (left hemisphere) and T6 (right hemisphere) electrodes among the three stimulus conditions (upright face, inverted face, and eyes) in each age group (8-13-year-olds)

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Research Enhancement Strategy Office,NIPS

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