4 Reasons to memorize immediately whatever you are practicing

1. Since attention is limited, the part engaged in reading notes is not available for focusing fully on technical and/or musical matters. Memorization frees attention for where it could be most useful.
   
   
2. Since our senses partly overlap, our auditory and kinesthetic senses (including tactile) are actually enhanced when supported by visual information. One can listen better to what you can also feel and hear.
   
3. Since there is a correlation between eye movements and internal sensory processing, freedom of eye movement, instead of fixation on the score, could actually enhance the processing of sensory information.
4. Fixation of our gaze on one limited area (the score) for prolonged periods often causes bad posture, resulting in sub-optimal bio-mechanics. Relaxed eyes with freedom to move around spontaneously is conducive to better posture and better concentration.