Knowing how to do it or doing it? A double dissociation between tool-gesture production and tool-gesture knowledge

• Main Authors: Aguiar de Sousa, D. (Author), Almeida, J. (Author), Leal, G. (Author), Pavão Martins, I. (Author), Santana, I. (Author), Schu, G. (Author), Valério, D. (Author)
• Format: Article
• Language: English
• Published: Masson SpA 2021
• Subjects: adult; apraxia; Apraxia; Apraxias; Arecaceae; Article; brain ischemia; brain mapping; Brain Mapping; case report; cingulate gyrus; clinical article; comparative study; controlled study; cortical thickness (brain); double dissociation; Double dissociation; episodic memory; female; gesture; Gestures; hemiparesis; homonymous hemianopia; human; Humans; image segmentation; inferior frontal gyrus; inferior parietal lobule; left hemisphere; left hippocampus; Magnetic Resonance Imaging; male; middle aged; Mini Mental State Examination; Montreal cognitive assessment; nuclear magnetic resonance imaging; object manipulation; Object processing; parietal lobe; Parietal Lobe; parietal operculum; precuneus; premotor cortex; primary motor cortex; primary somatosensory cortex; recognition; reversible cerebral vasoconstriction syndrome; right hippocampus; superior frontal gyrus; superior parietal lobule; supplementary motor area; supramarginal gyrus; tool gesture knowledge; tool gesture production; tool use; Tool-gesture knowledge; Tool-gesture production; vasoconstrictor agent; white matter lesion
• Online Access: View Fulltext in Publisher

 Deciding how to manipulate an object to fulfill a goal requires accessing different types of object-related information. How these different types of information are integrated and represented in the brain is still an open question. Here, we focus on examining two types of object-related information–tool-gesture knowledge (i.e., how to manipulate an object), and tool-gesture production (i.e., the actual manipulation of an object). We show a double dissociation between tool-gesture knowledge and tool-gesture production: Patient FP presents problems in pantomiming tool use in the context of a spared ability to perform judgments about an object's manipulation, whereas Patient LS can pantomime tool use, but is impaired at performing manipulation judgments. Moreover, we compared the location of the lesions in FP and LS with those sustained by two classic ideomotor apraxic patients (IMA), using a cortical thickness approach. Patient FP presented lesions in common with our classic IMA that included the left inferior parietal lobule (IPL), and specifically the supramarginal gyrus, the left parietal operculum, the left premotor cortex and the left inferior frontal gyrus, whereas Patient LS and our classic IMA patients presented common lesions in regions of the superior parietal lobule (SPL), motor areas (as primary somatosensory cortex, premotor cortex and primary motor cortex), and frontal areas. Our results show that tool-gesture production and tool-gesture knowledge can be behaviorally and neurally doubly dissociated and put strong constraints on extant theories of action and object recognition and use. © 2021 Elsevier Ltd