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Reversible-figure perception: mechanisms of intentional control
1Department of Psychology, Villanova University, Villanova, Pennsylvania 19085, USA. thomas.toppino@villanova.edu
Perception & Psychophysics
|January 9, 2004
Summary
Intentional control over Necker cube perception is possible, independent of focusing on specific visual features. This suggests top-down cognitive processes, not just feature attention, guide our perception and reveal its limitations.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Neuroscience
Background:
- Perception of ambiguous stimuli, like the Necker cube, can be influenced by observer's intentions.
- Focal-feature processing, or directing attention to specific stimulus parts, is a proposed mechanism for perceptual control.
Purpose of the Study:
- To investigate if voluntary control over Necker cube perception is mediated by focal-feature processing.
- To differentiate the roles of intention and focal-feature processing in controlling visual perception.
Main Methods:
- Two experiments were conducted using the Necker cube as a reversible figure.
- Participants' intentions and the focus of their primary processing were manipulated.
- The percentage of time each Necker cube orientation was perceived was recorded.
Main Results:
- In Experiment 1, both intention and focal-feature processing had additive effects on perception.
- In Experiment 2, focal-feature processing effects diminished with a smaller cube, while intentional control remained significant.
- Intentional control over perception was found to be independent of focal-feature processing.
Conclusions:
- Voluntary control of Necker cube perception can be achieved independently of focal-feature processing.
- Top-down mechanisms, such as activation or priming of perceptual representations, likely underlie intentional control.
- The study highlights both the capacity for and the limitations of intentional control in visual perception.