Section 1: Organisation of Motor Systems.- 1 Introduction.- 2 Central feedback loops and some implications for motor control.- 3 Neural control of vertebrate locomotion-central mechanisms and reflex interaction with special reference to the cat.- 4 Generation of behaviour: the orchestration hypothesis.- 5 Convergence of several sensory modalities in motor control.- 6 Feedback control of an escape behaviour.- Section 2: Central Control of Sense Organ Excitability.- 7 Introduction.- 8 Intrafusal muscle fibres in the cat and their motor control.- 9 How do crabs control their muscle receptors?.- Section 3: Afferent Input During Normal Movements.- 10 Introduction.- 11 What the cat’s hind limb tells the cat’s spinal cord.- 12 Proprioceptive feedback and the control of cockroach walking.- Section 4: Reflexes.- 13 Introduction.- 14 Stretch reflexes in man: the significance of tendon compliance.- 15 The synaptic basis for integration of local reflexes in the locust.- Section 5: The Control of Equilibrium.- 16 Introduction.- 17 Control of eye-head coordination by brain stem neurones.- 18 Multisensory interactions in the crustacean equilibrium system.- Section 6: The Control of Movement.- 19 Introduction.- 20 Are there central pattern generators for walking and flight in insects?.- 21 The role of movement-related feedback in the control of locomotion in fish and lamprey.- 22 How locusts fly straight.- 23 Interactions of segmental and suprasegmental inputs with the spinal pattern generator of locomotion.- 24 Stepping reflexes and the sensory control of walking in Crustacea.- Section 7: Feedback and Motor Control in Man.- 25 Introduction.- 26 Proprioceptive activity from human finger muscles.- 27 Human long-latency stretch reflexes — a new role for the secondary ending of the muscle spindle?.- 28 Phase dependent step adaptations during human locomotion.- 29 Abnormal feedback and movement disorders in man, with particular reference to cortical myoclonus.- Author index.