he Turing test was proposed to operationalize the notion of Intelligence by means of an empirical test. It is based on the idea whether the (verbal) behavior of a Computer can be distinguished from that of a human. If it cannot be distinguished, the Computer can be said to have intelligence. Because the Turing test is based on natural language, it is restricted to human intelligence. It is still an open question whether it is a good test for human intelligence.
von Rolf Pfeifer, Christian Scheier im Buch Understanding Intelligence (1999) im Text The Study of Intelligence auf Seite 32