Table 1.

A summary of language pathologies discussed in this paper.

	Semantic Dementia	Transcortical Sensory Aphasia	Reproduction Conduction Aphasia	Repetition Conduction Aphasia
Primary lesion Localization	temporal Pole	posterior MTG	left SMG and parietal operculum	superior temporal
Defining Symptom	loss of semantic knowledge	semantic paraphasia (TABLE → chair)	phonological paraphasia (PEN → pan)	impaired word recall and recognition
Auditory Word Comprehension	impaired	impaired	preserved	preserved
Nonverbal Comprehension	impaired	preserved	preserved	preserved
Speech Production	preserved	preserved	impaired	preserved
Phoneme Discrimination	preserved	preserved	impaired	preserved
Spoken Word Repetition	preserved	preserved	impaired	impaired
Hypothesized Affected Function	conceptual hub	ventral lexicon	dorsal lexicon	phonological short- term store
Alternate Term	primary progressive aphasia	word meaning deafness	word form deafness	associative aphasia