Langelaar, T.E. (Thijme) (2020) Sex-Deception and Emotion Recognition through gait in point-light-displays. thesis, Human Movement Sciences.
Full text available on request.Abstract
Background. Biological motion contains a wealth of information about the actions, intentions and emotions of others. Previous evidence indicates that this information need not be inferred. Instead, the dynamics underlying these properties can be picked up directly as laid out by the principle of kinematic specification of dynamics (KSD). Objectives. In experiment 1 a movement registration was carried out with the aim to identify differences in movement patterns of (1) non-deceptive gait compared to deceptive gait and (2) neutral gait compared to emotional gait. The data obtained from the movement registration were then transformed into point-lightdisplays (PLDs). These stimuli were used in two perceptual experiments. In experiment 2, perceivers made forced choice judgments on the real sex of the stimuli. In experiment 3, different perceivers made forced choice judgments on the emotional state of the stimuli. Methods. 46 participants were recruited to partake in experiment 1, where they walked on a treadmill. Motion capture markers were placed on 16 anatomical landmarks. First, they were asked to walk as they normally would. Next, they were asked to deceive potential perceivers on the status of their real sex (i.e. walk as if you were of the opposite sex). Finally, they were asked to convey three emotions through gait. Both the sex-deception task as well as the emotion task were carried out at three different speeds. Principal component analyses were carried out in order to analyze the kinematic patterns. The sex and emotional state of stimuli with different gait speeds and viewed from different angles was judged by 136 (experiment 2) and 165 perceivers (experiment 3) respectively. Results. The first six principal components captured 94.9% of the variance in the motion capture data. The variance explained by the first six components was lower for deceptive walking and running (94.8%) compared to non-deceptive (95.2%). Neutral walking was the least variable, followed by Sad, Angry and Happy. Increased gait speed resulted in lower moment to moment variability for all conditions. In experiment 2, perceivers were able to correctly identify the real sex of non-deceptive PLDs. Although deceptive PLDs decreased correct identification rates of perceivers, they were not able to deceive them. In experiment 3, in most cases perceivers were able to recognize Happy and Sad but not Angry through the gait of PLDs. The results are discussed in light of the principle of KSD and the notion of non-substitutability of genuine action. Keywords: Point-light-displays, Sex-deception, Emotion recognition, Kinematic specification of dynamics, Non-substitutability of genuine action
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Zaal, dr. ir. F.T.J.M. and Jacobs, dr. D.M. |
| Faculty: | Medical Sciences |
| Date Deposited: | 20 May 2022 09:12 |
| Last Modified: | 20 May 2022 09:12 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3364 |
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