The Adaptive Range of 1/f Isometric Force Production

Jacob J. Sosnoff, Andrew D. Valantine, Karl M. Newell

Research output: Contribution to journalArticlepeer-review


The adaptive range of 1/f dynamics in isometric force output was investigated. Participants produced isometric force to targets with predictable demands (constant and sinusoidal) and 1/f noise waveforms (white, pink, brown, and black) that also varied in the frequency bandwidth represented in the force signal (0-4 Hz, 0-8 Hz, and 0-12 Hz). The range of within-trial 1/f force dynamics produced was between darker than pink noise and lighter than black noise according to task conditions. The exponent of the respective 1/f force dynamics decreased as the frequency bandwidth of the force signal increased. The findings reveal an adaptive though restricted range of 1/f force variation that is modulated by the dynamics of the task constraints.

Original languageEnglish (US)
Pages (from-to)439-446
Number of pages8
JournalJournal of Experimental Psychology: Human Perception and Performance
Issue number2
StatePublished - Apr 2009


  • fractals
  • isometric force
  • motor control

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Behavioral Neuroscience


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