Shape recognition contributions to figure-ground reversal: which route counts?

Area of Science:

• Cognitive Psychology
• Visual Perception
• Computational Neuroscience

Background:

• Figure-ground segregation is a fundamental process in visual perception, determining which objects are perceived as distinct from their background.
• Gestalt principles, such as those related to shape and orientation, are known to influence figure-ground assignment.
• The interplay between shape recognition and figure-ground determination is not fully understood, particularly the temporal sequence of these processes.

Purpose of the Study:

• To investigate the influence of shape denotivity and orientation on figure-ground perception.
• To determine whether shape recognition processes precede or follow figure-ground computations.
• To propose a computational mechanism that explains the observed effects.

Main Methods:

• Participants viewed upright and inverted figure-ground stimuli where Gestalt variables indicated the center as figure.
• Stimuli varied in the denotivity of the surround (agreement on depicted shape).
• Four experiments measured how long the surround was maintained as figure and its likelihood of being perceived as figure.

Main Results:

• The surround was perceived as figure longer and more often when stimuli were upright compared to inverted.
• Higher surround denotivity in upright stimuli correlated with stronger figure-ground effects.
• These effects were attributed solely to orientation-specific shape representations influencing figure-ground computations.

Conclusions:

• Shape recognition, driven by orientation-specific cues, can influence figure-ground segregation.
• A non-ratiomorphic mechanism is proposed where shape recognition precedes definitive figure-ground determination.
• This challenges traditional views by suggesting that object recognition can guide, rather than solely result from, figure-ground assignment.