SENSORY ORIENTATION FOR BALANCE
Balance control (whether it is during quiet stance, in preparation for or in reaction to a threat
to balance) also involves the integration of information from multiple senses (vision,
vestibular and somatosensory systems) concerning information about the position and
movement of the body in space (for details see Chapter 2). For a specific task and context
the neural systems of the child must determine the accuracy of a given sensory input for
postural control, and then select the input that is the most appropriate for that context. For
example, if a child is walking in a dimly lit environment, s/he would need to rely less on
visual inputs and more on somatosensory and vestibular inputs. If s/he were walking down
a ramp in a dark cinema, somatosensory cues would be ambiguous and visual cues would
be almost absent, and thus vestibular inputs would be the primary inputs required to maintain
balance.
Experiments by Nashner et al. (1983) have examined the ability of both typically
developing children and children with CP (unilateral spastic CP and ataxia) to integrate
sensory information important for maintaining balance under different conditions that
changed the availability and accuracy of visual and somatosensory inputs for postural
orientation. Figure 5.2 shows the amplitude of anterior–posterior sway in typically
developing children, children with unilateral spastic CP and children with ataxia as they
stood under six different sensory conditions. The y axis shows the sway of the child
(performance ratio) with 0 indicating no sway and 1.0 indicating loss of balance. The left
SENSORY ORIENTATION FOR BALANCEBalance control (whether it is during quiet stance, in preparation for or in reaction to a threatto balance) also involves the integration of information from multiple senses (vision,vestibular and somatosensory systems) concerning information about the position andmovement of the body in space (for details see Chapter 2). For a specific task and contextthe neural systems of the child must determine the accuracy of a given sensory input forpostural control, and then select the input that is the most appropriate for that context. Forexample, if a child is walking in a dimly lit environment, s/he would need to rely less onvisual inputs and more on somatosensory and vestibular inputs. If s/he were walking downa ramp in a dark cinema, somatosensory cues would be ambiguous and visual cues wouldbe almost absent, and thus vestibular inputs would be the primary inputs required to maintainbalance.Experiments by Nashner et al. (1983) have examined the ability of both typicallydeveloping children and children with CP (unilateral spastic CP and ataxia) to integratesensory information important for maintaining balance under different conditions thatchanged the availability and accuracy of visual and somatosensory inputs for posturalorientation. Figure 5.2 shows the amplitude of anterior–posterior sway in typicallydeveloping children, children with unilateral spastic CP and children with ataxia as theyอยู่ภายใต้เงื่อนไขทางประสาทสัมผัสต่าง ๆ 6 แกน y แสดงกทางของเด็ก(อัตราประสิทธิภาพ) กับระบุกทางไม่และ 1.0 บ่งชี้สูญเสียสมดุล ด้านซ้าย
การแปล กรุณารอสักครู่..
