NROC64H3 Chapter Article: Karnath
Document Summary
The neural representation of postural control in humans (karnath) Lesion to vestibular cortex of posterior insula results in tilted perception of visual vertical but not to tilted body posture and loss of lateral balance. Contraversive pushing: an altered perception of the body"s orientation in relation to gravity: body is oriented upright: when actually tilted to ipsilesional side. Study aimed to identify another area responsible for sensing body orientation in relation to gravity. Ventral posterior and lateral posterior nuclei pf posterolateral thalamus is involved in the neural representation of second graviceptive system for control of upright body posture. Some patients with hemiparesis may lose lateral balance and fall toward the paralyzed side after a stroke. Listing phenomenon: patients begin to list toward the hemiplegic side in an upright (sitting) position when assistance given to prevent falling was withdrawn. Hemiplegic patients who use nonaffected arm/leg to push away actively from the nonparalyzed side.
