Figure 2.

Lichtheim’s language network. ‘M’ represents the motor pole of the network or Broca’s area and ‘A’ the perceptual pole or Wernicke’s area. ‘B’ represents the abstract notion of a ‘concept centre’; another of Lichtheim’s diagrams (right) shows that he was not however arguing that there was a single concept centre. The Wernicke–Lichtheim model predicts five patterns of aphasia: (1) Broca’s aphasia; (2) Wernicke’s aphasia; (3) conduction aphasia; (4) transcortical motor aphasia; (6) transcortical sensory aphasia. In addition, (7) could be viewed as depicting ‘pure word deafness’ and (5) the motor speech disorders including apraxia of speech.