Parietal associational cortex Domina Petric, MD https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Account for 75% of the cerebral mantle in each hemisphere. Association cortices Account for 75% of the cerebral mantle in each hemisphere. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Parietal associational cortex Refers to posterior parietal lobe. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Posterior parietal cortex http://neurones.co.uk https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Functions of posterior parietal cortex Attention: associational parietal cortex directs our attention to particular location in the outside world. DIRECTION OF ATTENTION! https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Hemineglect syndrome Lesion of the posterior parietal cortex leeds to the contralateral hemineglect syndrome. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

L R Hemineglect syndrome Lesion to the posterior parietal cortex leeds to the contralateral hemineglect syndrome. In this picture: left hemineglect syndrome, lesion is in the right posterior parietal cortex. https://plato.stanford.edu/entries/mental-imagery/unineglect.gif https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Asymmetry of attention There is asymmetry of attention in parietal associational cortex. For the left parietal cortex attention is focused across the midline to the right side of the visual world. For the right parietal cortex attention is distributed throughout the entire visual field. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Attention is focused to the right side of the visual world. Attention is distributed throughout the entire visual world. Attention is focused to the right side of the visual world. Left posterior parietal cortex Right posterior parietal cortex https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Asymmetry of attention When attention is directed towards the left side of visual world, there is activation of right parietal cortex. When attention is directed towards the right side of visual world, there is bilateral parietal activation. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Left vs. right hemineglect If the patient has the right posterior parietal lesion, there will be SEVERE LEFT HEMINEGLECT. If the patient has the left posterior parietal lesion, there will be MINIMAL RIGHT HEMINEGLECT. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Hemineglect syndrome In hemineglect syndrome, patient also neglects the contralateral part of the body. For example, patient with right lesion will neglect its left side of the body. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Posterior parietal cortex and body scheme Parietal lobe is critical for building the body image, the neural construct of SELF. https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University

Literature https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University http://neurones.co.uk https://plato.stanford.edu http://www.brainfacts.org https://www.coursera.org/learn/medical-neuroscience: Leonard E. White, PhD, Duke University