Rhythmic oscillations of visual contrast sensitivity synchronized with action

Alice Tomassini, Donatella Spinelli, Marco Jacono, Giulio Sandini, Maria Concetta Morrone

Research output: Contribution to journalArticlepeer-review


It is well known that the motor and the sensory systems structure sensory data collection and cooperate to achieve an efficient integration and exchange of information. Increasing evidence suggests that both motor and sensory functions are regulated by rhythmic processes reflecting alternating states of neuronal excitability, and these may be involved in mediating sensory-motor interactions. Here we show an oscillatory fluctuation in early visual processing time locked with the execution of voluntary action, and, crucially, even for visual stimuli irrelevant to the motor task. Human participants were asked to perform a reaching movement toward a display and judge the orientation of a Gabor patch, near contrast threshold, briefly presented at random times before and during the reaching movement. When the data are temporally aligned to the onset of movement, visual contrast sensitivity oscillates with periodicity within the theta band. Importantly, the oscillations emerge during the motor planning stage, ∼500 ms before movement onset. We suggest that brain oscillatory dynamics may mediate an automatic coupling between early motor planning and early visual processing, possibly instrumental in linking and closing up the visual-motor control loop.

Original languageEnglish
Pages (from-to)7019-7029
Number of pages11
JournalJournal of Neuroscience
Issue number18
Publication statusPublished - May 6 2015


  • Action
  • Brain oscillations
  • Phase locking
  • Sensory-motor
  • Vision

ASJC Scopus subject areas

  • Neuroscience(all)
  • Medicine(all)

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