Use this URL to cite or link to this record in EThOS:
Title: Mechanisms of human motion perception
Author: Tzoneva-Hadjigeorgieva, Maria
ISNI:       0000 0001 3540 6025
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 2007
Availability of Full Text:
Access from EThOS:
Observation of human movements provides a rich source of information about the physical and internal states of those around us. The thesis examines behavioural and brain responses to movement observation. The thesis starts by examining how observers' visual perception of point-light displays of human arm movements is influenced when the movements are perturbed by the introduction of temporal offsets into position data. From this it extends the technique of movement perturbation to whole-body ballet movements and examines, in novices and experts, the effect of temporal offsets put into position and joint-angle representations of movement. Finally, it measures event-related brain potentials (ERP) in response to viewing these original and perturbed ballet movements. Chapter 2 describes four experiments investigating the visual perception of point-light human movement when increasing levels of temporal offset are introduced to position and joint angle representations of movement. Temporal offsets into position preserve local motion of elements but cause displays to become less coherent in form and motion with increasing offsets. Temporal offsets into joint angles preserve the piecewise rigid structure of the body regardless of offset, but show less of the natural coordination for increasing offsets. Res~lts showed that at high noise levels the effects of temporal offsets were much' less when introduced into joint angles than position. In addition, an effect of expertise was only evident at low levels of offset. Chapter 3 examined stimulus relevant ERP elicited from posterior cortical areas in response to the ballet movements with and without temporal offsets into joint angles. An early negative response (N150-170) over bilateral inferior parietotemporal region was found to be modulated by temporal offset. Additionally, a late positive response (P3) was salient at the middle occipitoparietal area suggested involvement of attentional mechanisms during processing of biological motion.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available