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Electrophysiological recordings from the sub-oesophageal ganglion and cervical connective of Musca domestica have revealed the existence of units which integrate visual stimuli that elicit landing behaviour (light-off stimulus or expansion of a spatial pattern) and those which cause inhibition of a landing behaviour already in progress (light-on stimulus or contracting pattern).
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Chillemi et al. (1981) studied this question.
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