When placing an object, the eyes usually reach the placement location shortly before the object is set down (e.g., Ballard et al., 1992 Droll & Hayhoe, 2007 Droll et al., 2005 Epelboim et al., 1995). For instance, when grasping an object, the eyes usually reach the location where the object has to be grasped sometime before the hand (e.g., Crawford, Medendorp, & Marotta, 2004 Desmurget, Pelisson, Rossetti, & Prablanc, 1998 Droll & Hayhoe, 2007 Droll, Hayhoe, Triesch, & Sullivan, 2005 Mennie, Hayhoe, & Sullivan, 2006). In object-related actions, relevant visual information is normally used to control eye movements as well as hand movements. Relevant information is then extracted from the foveal region and used for the current task. Therefore, humans move their eyes, head, and body to bring the image of informative stimuli on the fovea.
The human eye has a rather small region on the retina where visual information can be processed with high resolution, the fovea. Results support the hypothesis of an LTM-based mode of attention selection during the execution of automatized sequential high-speed sensorimotor tasks.
Finally, neither eye–hand dynamics nor saccade accuracy correlated with hand movement durations in the dark. Importantly, the eye reached a location ahead of the hands even in the dark. Saccadic scan paths and the number of fixations were highly similar across illumination conditions, while fixation rates were lower and fixation durations were longer in the dark. Results demonstrated that participants indeed made systematic eye movements in the dark. Speed stacking is a sequential high-speed sensorimotor object manipulation task. In the present study, participants performed an automatized speed-stacking task in the dark and in the light while their eye movements were recorded. Recently, a long-term memory (LTM)-based direct control mode of attention during the execution of well-learned sensorimotor tasks, which predicts task-relevant saccades in the dark, was proposed (R. It is largely unknown whether and how saccades are executed in this case. Nevertheless, humans can perform such a task in the dark provided it was automatized beforehand. Saccades during object-related everyday tasks select visual information to guide hand movements.
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