Abstract
It has been claimed that increased reliance on context, or allocentric information, develops when aiming movements are more consciously monitored and/or controlled. Since verbalizing target features requires strong conscious monitoring, we expected an increased reliance on allocentric information when verbalizing a target label (i.e. target number) during movement execution. We examined swiping actions towards a global array of targets embedded in different local array configurations on a tablet under no-verbalization and verbalization conditions. The global and local array configurations allowed separation of contextual-effects from any possible numerical magnitude biases triggered from calling out specific target numbers.The patterns of constant errors in the target directionwere used to assess differences between conditions. Variation in the target context configuration systematically biased movement endpoints in both the no-verbalization and verbalization conditions. Ultimately, our results do not support the assertion that calling out target numbers during movement execution increases the context-dependency of targeted actions.
Highlights
Accurate perception is essential for directing actions towards and around objects in our immediate surroundings
In line with the task set-up of Rossetti, participants will move from a center position to a target that is presented within a global target array, we present some setup expansions to delineate the numerical magnitude bias from the visual context bias
Research supports the conjecture that actions are guided by a combination of egocentric and allocentric visual information, with the relative contribution of each being triggered by particular circumstances, such as the visibility of the target during movement execution
Summary
Accurate perception is essential for directing actions towards and around objects in our immediate surroundings. In target-directed actions actors are thought to primarily define the spatial position of objects or targets by the absolute distance of the body from the target (i.e., egocentric information). Certain circumstances are predicted to increase the reliance on object-to-object spatial relation ships, locating a target with respect to other objects irrespective of the actor’s location (i.e., allocentric information) (Milner & Goodale, 2008; Willingham, 1998). It is proposed that automatic movements are guided primarily by egocentric in formation, using on-line task relevant spatial information in dimensions of the object location relative to the actor. Movements supported by the conscious mode mainly utilize allocentric information, locating objects in a worldly context, independent of the actor’s vantage point (see Milner & Goodale, 2008).
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