1985 volume 14(2) pages 193 – 196
doi:10.1068/p140193

Cite as:
Gregory R L, 1985, "Movement nulling: for heterochromatic photometry and isolating channels for 'real' and 'apparent' motion" Perception 14(2) 193 – 196
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Movement nulling: for heterochromatic photometry and isolating channels for 'real' and 'apparent' motion

Richard L Gregory

Received 20 August 1985

Abstract. Null measurements given by cancelling forces, voltages, or whatever, are used in physics for gaining 'objectivity' -- by avoiding 'subjective' perceptions; but, somewhat paradoxically, null methods can be useful for studying perception itself. Here we consider cancelling opposed movements for photometry with coloured lights, and some recent experiments, carried out with John Harris, on nulling 'real' against opposed 'apparent' motion for teasing out some neural movement channels.

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