Improved Typing as a result of slight movement I've found that my typing performance (speed, accuracy, flow) are noticeably improved if I am swaying slightly, mostly side to side, in a non-regular manner.  I would estimate that the overall movement side to side is less than an inch.

This occurs for all typing tasks, and surprisingly also affects my piano-playing performance.  It is not necessary to be listening to music (though it can help), and only sometimes does the movement correspond to the actual typing itself.  I also find that if mistakes are made, this movement is disrupted, and that consciously re-starting the movement helps restore the induced state.

What could account for this effect?

I would personally suspect that it's acts to induce a sort of 'flow' state, but I'd like to know if this has been studied or even noticed elsewhere...
I personaly also play piano and see myself into that flow easly,

Check out what I just found

From: http://en.wikipedia.org/wiki/Flow_(psychology)


  Flow is the mental state of operation in which a person performing an
  activity is fully immersed in a feeling of energized focus, full
  involvement, and enjoyment in the process of the activity. In essence,
  flow is characterized by complete absorption in what one does
  
  (...)
  
  Components of flow
  
  Nakamura and Csíkszentmihályi identify the following six factors as
  encompassing an experience of flow.
  
  
  intense and focused concentration on the present moment merging of action and awareness
  a loss of reflective self-consciousness
  a sense of personal control or agency over the situation or activity
  a distortion of temporal experience, one's subjective experience of time is altered
  experience of the activity as intrinsically rewarding, also referred to as autotelic experience
  
  
  (...)


Check this out:


  Roy Palmer suggests that "being in the zone" may also influence movement patterns as better integration of the conscious and subconscious reflex functions improves coordination.
  
  (...)
  
  Music
  
  Musicians, especially improvisational soloists may experience a
  similar state of mind while playing their instrument. Research has
  shown that performers in a flow state have a heightened quality of
  performance as opposed to when they are not in a flow state. In a
  study performed with professional classical pianists who played piano
  pieces several times to induce a flow state, a significant
  relationship was found between the flow state of the pianist and the
  pianist’s heart rate, blood pressure, and major facial muscles. As the
  pianist entered the flow state, heart rate and blood pressure
  decreased and the major facial muscles relaxed. This study further
  emphasized that flow is a state of effortless attention. In spite of
  the effortless attention and overall relaxation of the body, the
  performance of the pianist during the flow state improved.