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BEGIN:VEVENT
DTSTAMP:20261009T184115Z
LOCATION:Summit Pavilion
DTSTART;TZID=America/Los_Angeles:20261021T173000
DTEND;TZID=America/Los_Angeles:20261021T183000
UID:HFESAM_ASPIRE 2026_sess257_POST508@linklings.com
SUMMARY:Directional Bias and Bilateral Symmetry in Thumbstick Control: An 
 Empirical Study of Hand and Target Location Effects
DESCRIPTION:Billy Park (GwangJu Institute of Science and Technology), Hann
 a Choi (Arizona State University), Gunhyuk Park (GwangJu Institute of Scie
 nce and Technology), and Heejin Jeong (Arizona State University)\n\nThumbs
 ticks are widely adopted input devices for gaming, virtual reality, and re
 mote robot control owing to their simple and intuitive manipulation. Howev
 er, the kinematic characteristics of thumbstick manipulation within their 
 workspace remain insufficiently characterized, given the mismatch between 
 the thumb's anatomical movement and the device's two-dimensional analog wo
 rkspace. In this study, we empirically investigate how hand and target loc
 ation affect endpoint distribution, directional bias, and perceived diffic
 ulty during thumbstick control. We conducted a within-subjects experiment 
 with 20 participants performing a target selection task on a commercial ga
 mepad with symmetrical thumbsticks, with targets arranged in two concentri
 c arrays s (radii of 0.5 and 1.0) at eight directions. A total of 19,200 t
 rials were collected across both hands. Endpoint distributions revealed sy
 stematic directional biases that varied with target location. While bilate
 ral symmetry was preserved across most target locations, a distinct rotati
 onal shift emerged along the vertical axis: clockwise for the left hand an
 d counterclockwise for the right hand. Subjective difficulty ratings furth
 er indicated that transitions involving inner targets were significantly m
 ore difficult than those toward outer targets. These findings supports pre
 vious empirical grounding for designing direction-aware transfer functions
  and suggest cross-hand calibration transfer in thumbstick applications.\n
 \n
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