Interpersonal Fitts' law: When two perform as one

Justin Fine, Eric Amazeen

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Intra- and interpersonal coordination was investigated using a bimanual Fitts' law task. Participants tapped rhythmically between pairs of targets. Tapping was performed with one hand (unimanual), two hands (intrapersonal coordination), and one hand together with another participant (interpersonal coordination). The sizes and distances of targets in a pair were manipulated independently for each hand. When target difficulty was unequal across hands, movement times were similar in the coordination conditions, in violation of Fitts' law. Processing speed (measured by index of performance) increased for more difficult tasks, suggesting increased attention, even for dyads. These findings suggest that similar processes, not captured by centralized control, guide coordination for both individuals and dyads. Measures of coordination, though, still showed stronger coordination tendencies for intrapersonal coordination, indicating a possible role for centralized mechanisms.

Original languageEnglish (US)
Pages (from-to)459-469
Number of pages11
JournalExperimental Brain Research
Issue number3-4
StatePublished - Jun 2011


  • Coordination
  • Fitts' law
  • Joint-action
  • Motor control

ASJC Scopus subject areas

  • General Neuroscience


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