Fast and slow feedback loops for the visual correction of spatial errors in a pointing task: a reappraisal

摘要: Experimental evidence supporting the idea that central and peripheral vision play a distinctive role in on-line visual guidance of reaching movements is reappraised. The retina, highly sensitive for discrimination relative position cues, subserves error-detecting mechanisms encode discrete rate change location moving hand to stationary target, feeding slow corrective feedback loops allow accurate homing on target. mainly detection continuous motion swept by image towards fovea, which itself strongly anchored target during whole course movement, thus providing directional error signal used fast correction movement trajectory. This interpretation fits two-system model perception derived from psychophysical data. It also anatomical physiological data concerning distribution static kinetic cues through two separate channels. However, way reafferent information involved both further conveyed control system arm-hand remains largely unknown.