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Task Dependent Effects of Head Orientation on Perceived Gaze Direction
Tarryn Balsdon1,2, Colin W G Clifford1
1School of Psychology, University of New South Wales, Sydney, NSW, Australia.
Frontiers in Psychology
|December 22, 2018
Summary
Head orientation influences gaze perception differently based on task design. This suggests the brain flexibly weights sensory cues for gaze direction, influenced by the observer's goal.
Area of Science:
- Visual perception
- Human psychophysics
- Sensory integration
Background:
- Gaze direction perception integrates external cues like head orientation.
- Head orientation typically has a repulsive effect on perceived gaze direction.
- Previous findings showed task-dependent differences in head orientation's influence on gaze perception.
Purpose of the Study:
- Investigate why head orientation's effect on gaze perception varies with task design.
- Determine if task type (directional vs. non-directional judgment) or stimulus interaction causes the difference.
- Explore the role of pupil/iris cues and evidence accumulation in these task-dependent effects.
Main Methods:
- Employed single- and two-interval tasks to assess gaze direction perception.
- Conducted four experiments manipulating task design and stimuli.
- Analyzed judgments of directional (left/right) and non-directional (direct/indirect) gaze.
Main Results:
- The difference in head orientation's effect stemmed from the type of judgment required, not stimulus interaction.
- Observers did not rely on pupil/iris cues for non-directional judgments.
- Evidence accumulation and processing durations were similar across tasks.
Conclusions:
- Sensory information from head orientation is flexibly weighted in gaze perception.
- The observer's goal or task influences how sensory information is used to perceive gaze direction.
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