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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • Ideomotor theory posits that response selection involves anticipating action consequences.
  • The response-effect compatibility (REC) effect demonstrates faster responses when action effects align with the response.
  • Previous research established REC effects with predictable action outcomes.

Purpose of the Study:

  • To investigate whether action effects must be exactly predictable or if categorical predictability suffices for the REC effect.
  • To determine the role of precise spatial predictability of action effects on response times.
  • To explore potential abstraction of critical features from action effects for response selection.

Main Methods:

  • Experiments manipulating the predictability of action effect locations (exact vs. unpredictable).
  • Participants performed left-hand and right-hand responses associated with action effects.
  • Response times were measured under conditions of compatible and incompatible action effects.

Main Results:

  • A standard REC effect was observed when action effect locations were perfectly predictable.
  • When spatial locations of action effects were unpredictable, the REC effect was significantly diminished.
  • Large individual differences were noted, but on average, precise predictability was crucial.

Conclusions:

  • The spatial location of action effects must be precisely predictable to exert a strong influence on response selection and speed.
  • Categorical predictability alone, without exact spatial information, appears insufficient to elicit a robust REC effect.
  • Findings suggest that abstracting spatial features from unpredictable action effects is not a dominant mechanism for action selection.