The Interaction Between Visual Information And Semantic Knowledge During Motion Tracking

The interaction between visual information and semantic knowledege during motion tracking is a fundamental issue in cognitive psychology. When tracking a moving target, shape information and motion information of a target have to be matched with category-specific sematic knowledge. Human have to predict target tracetory during motion tracking. Prediction is modulated by some visual features of target and by category-specific sematic knowledge. However, the interaction between visual information and semantic knowledege during motion tracking is to be ignored. Recent studies have demonstrated that the interaction between visual information and semantic knowledege during motion tracking exsited. While these data show a ambiguity the interaction between visual information and semantic knowledege. In present study, we used the temporal occlusion paradigm, labeling biological and non-biological stimuli as tracking target. We analyzed the behavioral data, eye tracking signal and blood oxygenation level-dependent contrast.Results showed that (1) during visible-guided eye-tracking of moving target, fast speed decreased visual tracking performance. Meanwhile, during memory-guided eye-tracking of moving target, the stronger semantic relation of background and target decreased visual tracking performance of a fast target.(2) During visible and memory-guided eye-tracking of moving target, biological motion tracking is affected by Local but not global biological-motion processing.(3) During visible-guided eye-tracking of moving target, global novelty (e.g., inverted human figure) can reduced visual tracking a biological stimulus.(4) Temproal superior cortex and Frontal superior cortex were more activated during eye-guided tracking of moving target. Cingulum, Hippocampus and Thalamus were more activated during memory-guided tracking of moving target. Cerebellum has the function of an internal clock that measures time intervals in the millisecond range. Such an exact timing of very short intervals subserves biological motion tracking. These results indicated that during visible and memory-guided eye-tracking of moving target, subjects predict target trajectory by referring to biological and non-biological category-specific sematic knowledge. The interaction between visual information and semantic knowledege during motion tracking is complicated. Discussed that it was to serves as the formal basis for inference and for connection with world knowledge and perception.