Dissociating perception from judgment in the action-specific effect of blocking ease on perceived speed

Area of Science:

• Cognitive Psychology
• Visual Perception
• Motor Control

Background:

• The action-specific approach posits that motor capabilities directly shape perceptual processes, particularly in spatial vision.
• An alternative view suggests that general judgment processes, rather than perception itself, influence action-related evaluations.
• Distinguishing between perception-based and judgment-based influences is crucial for understanding this relationship.

Purpose of the Study:

• To investigate whether the influence of action on perception is indeed perceptual or merely judgment-based.
• To explore the distinction between trial-outcome effects (judgment-based) and paddle-size effects (potentially perceptual).
• To determine if these effects dissociate across different populations and experimental manipulations.

Main Methods:

• Two distinct effects were produced: a trial-outcome effect (judgment-based) and a paddle-size effect (under debate).
• Experiment 1 compared older and younger adults to assess dissociations, considering age-related differences in nonperceptual factors.
• Experiment 2 used a cover story to manipulate perceived performance and its impact on both effects.

Main Results:

• Both experiments revealed dissociations between the trial-outcome effect and the paddle-size effect.
• These dissociations suggest that the two effects are underpinned by separate processes.
• The findings indicate that one effect is clearly judgment-based, while the other is not.

Conclusions:

• The observed dissociations support the action-specific approach to perception.
• The ease with which an action can be performed (paddle-size effect) perceptually influences estimations of object properties like speed.
• This research provides evidence that the action-specific effect on estimated ball speed is perceptual in nature.