Extension of corticocortical afferents into the anterior bank of the intraparietal sulcus by tool-use training in adult monkeys
| Autor: | Hisayuki Ojima, Atsushi Iriki, Shigeru Obayashi, Sayaka Hihara, Shizuko Ichinose, Naotaka Fujii, Tomonori Notoya, Michio Tanaka |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Visual perception
Cognitive Neuroscience Amidines Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate Biotin Posterior parietal cortex Experimental and Cognitive Psychology Intraparietal sulcus Somatosensory system Behavioral Neuroscience Microscopy Electron Transmission Parietal Lobe Cortex (anatomy) medicine Animals Learning Neurons Afferent Pathways Brain Mapping Behavior Animal Histocytochemistry Motor Cortex Parietal lobe Dextrans Somatosensory Cortex Macaca fascicularis medicine.anatomical_structure Cerebral cortex Psychology Neuroscience Psychomotor Performance Motor cortex |
| Zdroj: | Neuropsychologia. 44:2636-2646 |
| ISSN: | 0028-3932 |
| DOI: | 10.1016/j.neuropsychologia.2005.11.020 |
| Popis: | When humans use a tool, it becomes an extension of the hand physically and perceptually. Common introspection might occur in monkeys trained in tool-use, which should depend on brain operations that constantly update and automatically integrate information about the current intrinsic (somatosensory) and the extrinsic (visual) status of the body parts and the tools. The parietal cortex plays an important role in using tools. Intraparietal neurones of naïve monkeys mostly respond unimodally to somatosensory stimuli; however, after training these neurones become bimodally active and respond to visual stimuli. The response properties of these neurones change to code the body images modified by assimilation of the tool to the hand holding it. In this study, we compared the projection patterns between visually related areas and the intraparietal cortex in trained and naïve monkeys using tracer techniques. Light microscopy analyses revealed the emergence of novel projections from the higher visual centres in the vicinity of the temporo-parietal junction and the ventrolateral prefrontal areas to the intraparietal area in monkeys trained in tool-use, but not in naïve monkeys. Functionally active synapses of intracortical afferents arising from higher visual centres to the intraparietal cortex of the trained monkeys were confirmed by electron microscopy. These results provide the first concrete evidence for the induction of novel neural connections in the adult monkey cerebral cortex, which accompanies a process of demanding behaviour in these animals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect