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How Brain-like is the Spinal Cord?

- Interacting Cell Assemblies in the Nervous System

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'Theorizing about brain functions is often considered slightly disreputable and anyhow a waste of time -perhaps even 'philoso- ical'' 1 P. S. CHURCHLAND At present there are no unanimously accepted general con- cepts of brain operation and function. This is especially the case with regard to so-called 'higher' functions such as per- ception, memory or the coupling between sensory input and motor output. There are a number of different reasons for this. Some may be related to experimental limitations allowing the simultaneous recording of the activities of only a restricted number of neurones. But there are also conceptual difficulties hindering the transition from 'single-neurone' schemes, in which neurones are assigned relatively specific tasks (such as feature detection), to more complex schemes of nerve cell as- semblies (for a discussion of some of the difficulties see Abeles 1982; von der Malsburg 1981; Kriiger 1983). Whilst much is known about the basic properties and functions of single neu- rones, whose operations we hope to understand in the foresee- able future, this does not hold true in the same way for the working of large assemblies of neurones.

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