Touch Pointing Performance for Uncertain Touchable Sizes of 1D Targets

Usuba, Hiroki; Yamanaka, Shota; Miyashita, Homei

doi:10.1145/3338286.3340131

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…Incentives also modulate movement durations (Ashworth-Beaumont & Nowicky, 2013; Bogacz et al, 2010; Du et al, 2022; Listman et al, 2021; Thura et al, 2014), further supporting flexibility in the strategies the brain employs when selecting movement parameters. We also note that other studies of Fitts’ Law in virtual environments, where visual and physical dimensions of the target do not necessarily match, largely align with our results in showing that both the visual and motor dimensions can predict movement durations under specific contexts (Usuba et al, 2019, 2021). Future investigations can address other, perhaps more cognitive indicators of difficulty, such as the visually inferred weight or unwieldiness of a tool (Ellis & Lederman, 1993).…”

Section: Discussionsupporting

confidence: 90%

Independent influences of movement distance and visual distance on Fitts’ law.

Al-Fawakhiri,

McDougle

2024

Journal of Experimental Psychology: General

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Fitts' Law is one among a small number of psychophysical laws. However, a fundamental variable in Fitts' Law-the movement distance, D-confounds two quantities: The physical distance the effector has to move to reach a goal, and the visually perceived distance to that goal. While these two quantities are functionally equivalent in everyday motor behavior, decoupling them might improve our understanding of the factors that shape speed-accuracy tradeoffs. Here, we leveraged the phenomenon of visuomotor gain adaptation to de-confound movement and visual distance during goal-directed reaching. We found that movement distance and visual distance can influence movement times, supporting a variant of Fitts' Law that considers both. The weighting of movement versus visual distance was modified by restricting movement range and degrading visual feedback. These results may reflect the role of sensory context in early stages of motor planning. Public Significance StatementYou will automatically slow your movement when picking up a needle 5 inches away versus a handkerchief 3 inches away. This fact is elegantly formalized by Fitts' Law, which mathematically relates movement duration to movement difficulty. However, one of the fundamental variables in the law-the distance of a planned movement-is ambiguous: Is it the actual distance the hand must move that biases movement duration, or is it the visually perceived distance? We decoupled these variables, finding that Fitts' Law is shaped by both quantities, and that the influence of one versus the other may be related to the relevance of visual information. We believe our "addendum" to Fitts' Law is timely, as everyday motor behavior has become increasingly enmeshed with virtual environments that abstract our movements into digital realities.

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Section: Discussionsupporting

confidence: 90%

Independent influences of movement distance and visual distance on Fitts’ law.

Al-Fawakhiri,

McDougle

2024

Journal of Experimental Psychology: General

View full text Add to dashboard Cite

show abstract

Independent Influences of Movement Distance and Visual Distance on Fitts' Law

Al-Fawakhiri,

McDougle

2023

Preprint

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Fitts Law is among a handful of psychophysical laws. However, one of the fundamental variables of Fitts Law - the movement distance, D - confounds two variables: the physical distance the effector has to move to reach a goal, and the visually perceived distance to that goal. While these two quantities are functionally equivalent in typical motor behaviors, decoupling them might improve our understanding of Fitts Law. Here we leveraged the phenomenon of visuomotor gain adaptation to de-confound movement and visual distance during goal-directed upper-limb movements. We found that movement distance and visual distance can influence movement times, supporting a variant of Fitts Law that considers both. The weighting of movement versus visual distance was modified by restricting movement range (emphasizing vision) or degrading visual feedback (emphasizing proprioception). These results reflect a multisensory integration process in the computation of expected movement difficulty, perhaps during early stages of motor planning.

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