When people are required to indicate the vanishing location of a moving object, systematic biases forward, in the direction of motion, and downward, in the direction of gravity, are usually found. Both these displacements, called representational momentum and representational gravity, respectively, are thought to reflect anticipatory internal mechanisms aiming to overcome neural delays in the perception of motion. We challenge this view. There may not be such a single mechanism. Although both representational momentum and representational gravity follow a specific time-course, compatible with an anticipation of the object's dynamics, they do not seem to be commensurable with each other, as they are differentially modulated by relevant variables, such as eye movements and strength of motion signals. We found separate response components, one related to overt motor localization behaviour and one limited to purely perceptual judgement. Representational momentum emerged only for the motor localization task, revealing a motor overshoot. In contrast, representational gravity was mostly evident for spatial perceptual judgements. We interpret the results in support of a partial dissociation in the mechanisms that give rise to representational momentum and representational gravity, with the former but not the latter strongly modulated by the enrolment of the motor system.

De Sá Teixeira, N.a., Kerzel, D., Hecht, H., & Lacquaniti, F. (2019). A novel dissociation between representational momentum and representational gravity through response modality. PSYCHOLOGICAL RESEARCH, 83(6), 1223-1236 [10.1007/s00426-017-0949-4].

A novel dissociation between representational momentum and representational gravity through response modality

Lacquaniti, Francesco
2019

Abstract

When people are required to indicate the vanishing location of a moving object, systematic biases forward, in the direction of motion, and downward, in the direction of gravity, are usually found. Both these displacements, called representational momentum and representational gravity, respectively, are thought to reflect anticipatory internal mechanisms aiming to overcome neural delays in the perception of motion. We challenge this view. There may not be such a single mechanism. Although both representational momentum and representational gravity follow a specific time-course, compatible with an anticipation of the object's dynamics, they do not seem to be commensurable with each other, as they are differentially modulated by relevant variables, such as eye movements and strength of motion signals. We found separate response components, one related to overt motor localization behaviour and one limited to purely perceptual judgement. Representational momentum emerged only for the motor localization task, revealing a motor overshoot. In contrast, representational gravity was mostly evident for spatial perceptual judgements. We interpret the results in support of a partial dissociation in the mechanisms that give rise to representational momentum and representational gravity, with the former but not the latter strongly modulated by the enrolment of the motor system.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/09
English
Con Impact Factor ISI
De Sá Teixeira, N.a., Kerzel, D., Hecht, H., & Lacquaniti, F. (2019). A novel dissociation between representational momentum and representational gravity through response modality. PSYCHOLOGICAL RESEARCH, 83(6), 1223-1236 [10.1007/s00426-017-0949-4].
De Sá Teixeira, Na; Kerzel, D; Hecht, H; Lacquaniti, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/190541
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