Full Idea
If we inferred other minds simply from behaviour, we would conclude that radios are conscious; it is rather the combination of behaviour with knowledge of the causal underpinnings of behaviour.
Gist of Idea
Other minds are not inferred by analogy, but are our best explanation
Source
John Searle (The Rediscovery of the Mind [1992], Ch. 1.V.4)
Book Reference
Searle,John R.: 'The Rediscovery of the Mind' [MIT 1999], p.22
A Reaction
Personally I am inclined to think that Searle has said the last word on the fairly uninteresting problem of other minds. Dualism generates a deep privacy problem, and analogy is a flawed argument, but best explanation is exactly what we rely on.