Dual-tasking: Is manual tapping independent of concurrently executed saccades?

Sharikadze, Megi; Cong, Dung-Khac; Staude, G.; Deubel, Heiner; Wolf, W.

doi:10.1016/j.brainres.2009.05.065

Cited by 7 publications

(3 citation statements)

References 55 publications

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“…The absence of structure in the keystroke-related saccades of Experiment 3 suggests that there is no temporal coupling between saccades and keystrokes when both are produced in independent tasks. This result is in full agreement with the study of Sharikadze et al (2009), who also found no interference between a saccadic eye movement and continuous periodic typing.…”

Section: Resultssupporting

confidence: 92%

“…Previous studies have investigated processing limitations in hand-eye coordination in tasks in which eyes and hands are used as effectors to convey two different responses (Claeys et al, 1998;Sailer, Eggert, Ditterich, & Straube, 2000;Sharikadze, Cong, Staude, Deubel, & Wolf, 2009;Stuyven, Van der Goten, Vandierendonck, Claeys, & Crevits, 2000; see Huestegge, 2011) for a review). The main conclusion that can be drawn from these works is that rhythmic tapping is controlled by a separate periodic mechanism, which does not demand a cognitive stage that would interfere with saccade generation.…”

Section: Discussionmentioning

confidence: 99%

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Freedom and rules in human sequential performance: A refractory period in eye-hand coordination

Shalóm

Sigman

2013

Journal of Vision

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In action sequences, the eyes and hands ought to be coordinated in precise ways. The mechanisms governing the architecture of encoding and action of several effectors remain unknown. Here we study hand and eye movements in a sequential task in which letters have to be typed while they move down through the screen. We observe a strict refractory period of about 200 ms between the initiation of manual and eye movements. Subjects do not initiate a saccade just after typing and do not type just after making the saccade. This refractory period is observed ubiquitously in every subject and in each step of the sequential task, even when keystrokes and saccades correspond to different items of the sequence-for instance when a subject types a letter that has been gazed at in a preceding fixation. These results extend classic findings of dual-task paradigms, of a bottleneck tightly locked to the response selection process, to unbounded serial routines. Interestingly, while the bottleneck is seemingly inevitable, better performing subjects can adopt a strategy to minimize the cost of the bottleneck, overlapping the refractory period with the encoding of the next item in the sequence.

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Section: Resultssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Freedom and rules in human sequential performance: A refractory period in eye-hand coordination

Shalóm

Sigman

2013

Journal of Vision

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“…As mentioned, one approach would be to sample more widely, especially toward the limit of the motor production system, in order to assess the postulated hinge supplied by motor noise at short intervals. Another avenue is to assess in more detail the relation between finger and eye motor control through task interference studies (Sharikadze, Cong, Staude, Deubel, & Wolf, 2009), or to access timing information with high precision directly at the cortical level.…”

Section: Discussionmentioning

confidence: 99%

Shared timing variability in eye and finger movements increases with interval duration: Support for a distributed timing system below and above one second

Karampela

Holm

Madison

2015

Quarterly Journal of Experimental Psychology

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The origins of the ability to produce action at will at the hundreds of millisecond to second range remain poorly understood. A central issue is whether such timing is governed by one mechanism or by several different mechanisms, possibly invoked by different effectors used to perform the timing task. If two effectors invoke similar timing mechanisms, then they should both produce similar variability increase with interval duration (interonset interval) and thus adhere to Weber's law (increasing linearly with the duration of the interval to be timed). Additionally, if both effectors invoke the same timing mechanism, the variability of the effectors should be highly correlated across participants. To test these possibilities, we assessed the behavioural characteristics across fingers and eyes as effectors and compared the timing variability between and within them as a function of the interval to be produced (interresponse interval). Sixty participants produced isochronous intervals from 524 to 1431 ms with their fingers and their eyes. High correlations within each effector indicated consistent performance within participants. Consistent with a single mechanism, temporal variability in both fingers and eyes followed Weber's law, and significant correlations between eye and finger variability were found for several intervals. These results can support neither the single clock nor the multiple clock hypotheses but instead suggest a partially overlapping distributed timing system.

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An eye-to-hand magnet effect reveals distinct spatial interference in motor planning and execution

et al. 2013

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An important question in oculomanual control is whether motor planning and execution modulate interference between motion of the eyes and hands. Here we investigated oculomanual interference using a novel paradigm that required saccadic eye movements and unimanual finger tapping. We examined finger trajectories for spatial interference caused by concurrent saccades. The first experiment used synchronous cues so that saccades and taps shared a common timekeeping goal. We found that finger trajectories showed bilateral interference where either finger was attracted in the direction of the accompanying saccade. The second experiment avoided interference due to shared planning resources by examining interference caused by reactive saccades. Here, we observed a lesser degree of execution-dependent coupling where the finger trajectory deviated only when reactive saccades were directed toward the hemifield of the responding hand. Our results show that distinct forms of eye-to-hand coupling emerge according to the demands of the task.

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Dual-tasking: Is manual tapping independent of concurrently executed saccades?

Cited by 7 publications

References 55 publications

Freedom and rules in human sequential performance: A refractory period in eye-hand coordination

Freedom and rules in human sequential performance: A refractory period in eye-hand coordination

Shared timing variability in eye and finger movements increases with interval duration: Support for a distributed timing system below and above one second

An eye-to-hand magnet effect reveals distinct spatial interference in motor planning and execution

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