Anosagnosia
What is anosagnosia and where is the lesion responsible for it? Anosagnosia is the unawareness of illness or impairment, such as hemiparesis or blindness, and is most commonly observed with right parietal lesions.
Mental Health
Topographagnosia
What is topographagnosia and where is the lesion responsible for it? Topographagnosia is the inability to navigate complex spatial layouts, such as a city, a building, or even one’s home, and to describe verbally or with a map how to get to a specific place or room. This difficulty is often combined with some degree of unilateral …
Agnosia
What is agnosia? Agnosia is the inability to recognize objects despite adequate perception in the modality in which the object is presented. The below table summarizes the comparison of the types of agnosias. Forms of Agnosia or Neglect Definition Associated Features Anatomic Localization Topographagnosia Inability to navigate complex layouts Often unilateral neglect Right occipitoparietal or bilateral …
Constructional Apraxia
What is constructional apraxia and where is the lesion underlying it? Constructional apraxia involves difficulty in copying figures and designs (drawing) but is not caused by a true apraxia. It is also associated with right parietal lobe lesions.
Dressing apraxia
What is dressing apraxia and where is the lesion that produces it? Dressing apraxia is not a true apraxia. The difficulty in dressing is a result of the inability to align the body axis with the axis of the garment, a complex visuospatial task. Dressing apraxia is a nondominant parietal lobe symptom that is often associated with …
Limb kinetic apraxia
What is limb kinetic apraxia and where is the lesion that produces it? Limb kinetic apraxia is a loss of dexterity and coordination of fine distal limb movements. The lesion producing it usually includes the contralateral supplementary motor cortex.
Features of anterior callosal apraxia
What are the features of anterior callosal apraxia? An anterior callosal lesion disconnects the right premotor cortex (left hand) from the left hemisphere (left inferior parietal lobe), yielding an apraxia to verbal commands confined to the left hand (left ideomotor apraxia). Sympathetic and anterior callosal apraxias are essentially the same syndrome due to interruption of the …