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Sittig's monograph is based on clinical study. He divides knowledge of apraxia into the pre-Liepmann and post-Liepmann eras. Hughlings Jackson was apparently the first to describe apraxia, but never gave it a name. In 1870, Finkelnburg gave the name asymbolia to all forms of disturbance in symbol formation and understanding. In 1870, Meynert defined motor asymbolia as the failure to appreciate the use of an object, along with a loss of perception of it. Sensory asymbolia was defined as the loss of recognition of objects. These disorders were looked on by Pick as apraxia, but Heilbronner clarified the problem by calling the motor type apraxia and the sensory agnosia. In 1899, de Buck, a Belgian, published a case of apraxia and preceded Liepmann's views by a year. However, it was not until Liepmann, in 1900, that ideas of apraxia were more or less clarified. He showed that the disturbance was
Ueber Apraxie. Arch NeurPsych. 1932;28(1):245–246. doi:https://doi.org/10.1001/archneurpsyc.1932.02240010253021
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