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Perspective changes, face recognition under ERP Study

Author: TianZuoMing
Tutor: YangZhaoNing
School: Qufu Normal University
Course: Basic Psychology
Keywords: Face recognition ERP Perspective Inversion effect Adaptation effect
CLC: B842.1
Type: Master's thesis
Year: 2011
Downloads: 125
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Abstract


Face recognition is a person in the social life is an important feature. Wherever possible we face recognition, to obtain the information we need. Because faces can provide such a wealth of information for face recognition research has also become a social hot spot. Previous studies have shown that face recognition, age, gender, ethnicity, expression, viewpoint and so impact on face recognition, face specificity for controversial ingredients - N170 influencing factors, such as the inter-stimulus interval, time to adapt to the different perspective, and so also have in-depth discussions. In contrast everyday life, we face recognition mostly horizontally rotated, then rotated in the horizontal direction, the face recognition is how the performance of it? N170 will emerge? Different circumstances, what is different? This study explores the contents of these. The study included two experiments: Experiment 1 fusion experimental paradigm change Oddball and learning - recognition paradigm to investigate two problems: First, face inversion effect, and second, whether the specific tasks carried out on facial identity processing; experiment two using repeated adaptation paradigm to investigate the case of face angle change identity. The first part of the experiment is to determine the appearance of the face task orientation (upright or inverted), key \Experiment II's mission is to stimulate the emergence test determines whether and when the adaptation stimulus for the same identity, according to the different key reactions. Experimental records subjects' reaction time, accuracy and EEG data. The results showed that: 1. Behavior data show that in determining face Kong Zhengli experiments inverted, the inverted face determine the correct rate higher and faster reaction time. This result suggests that the recognition that people will first task is the same according to the customary distinction, then, the faster things different experience to give a negative result, the need for an affirmative answer can be processed relatively detailed an answer . The EEG results showed that, compared with upright faces, inverted faces triggered a longer incubation period P1 and N170; P1 amplitude than upright faces, while the N170 amplitude but opposite performance. This result suggests that changes in the case of an inverted perspective effect still exists, but faces the direction of the face recognition will affect the results. (2) conduct comprehensive experimental data and a second part of the analysis of EEG data obtained, were tested in the task of upright inverted no identity consciousness processing; recognition task on the novel stimulus in the correct rejection rate in the other two faces, but the response time longer;'s face appeared on the front inverted lowest rate of correct judgment and reaction time up front there have been no face the highest rate of correct responses, and the front upright faces appeared correct response rate was significantly higher than the inverted appeared. EEG differences between right and left hemispheres reaction occurs. 3 Repeat adaptation experiments, N170 amplitude is greater than the right brain left brain, identify the different faces of the same face recognition N170 amplitude ratio larger amplitude. These results support the previous studies have shown unfamiliar faces on early identification of adaptation effect, described the extraction of a single face occupies characterization face machining early time. Adaptation stimulus is positive, the test stimulus for the deflection of the N170 amplitude ratio to adapt to stimulate the deflection, the test is positive when the stimulus should be large, which may indicate a positive face to adapt after more information is obtained, it activates more brain areas. The results presented in the case of changing the viewing angle performance of face recognition, obtained in the case of changing the viewing angle, and repetition adaptation effect inversion effects are present. Cognitive tasks may be difficult because of relatively large, compared with previous findings, P1 and N170 are set back by a 30-50ms, which may indicate the direction of the face included in the face in the early processing stages of processing. According to the study results suggest that, in face recognition, people will be based on the current requirement to adopt a process can be the fastest way to achieve the purpose of face processing.

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