Abstract
We examined how cognitive set influences the long latency components of normal postural responses in the legs. We disturbed the postural stability of standing human subjects with sudden toe-up ankle rotations. To influence the subjects' cognitive set, we varied the rotation amplitude either predictably (serial 4° versus serial 10°) or unpredictably (random mixture of 4° and 10°). The subjects' responses to these ankle rotations were assessed from the EMG activity of the tibialis anterior, the medial gastrocnemius, and the vastus lateralis muscles of the left leg. The results indicate that, when the rotation amplitude is predictable, only the amplitude of the long latency (LL) response in tibialis anterior and vastus lateralis varied directly with perturbation size. Furthermore, when the rotation amplitude is unpredictable, the central nervous system selects a default amplitude for the LL response in the tibialis anterior. When normal subjects are exposed to 2 pertubation amplitudes which include the potential risk of falling, the default LL response in tibialis anterior appropriately anticipates the larger amplitude perturbation rather than the smaller or an intermediate one.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 353-358 |
| Number of pages | 6 |
| Journal | Electroencephalography and Clinical Neurophysiology/ Evoked Potentials |
| Volume | 81 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1991 |
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Keywords
- Balance
- Cognitive set
- EMG
- Long-latency
- Motor control
- Posture
ASJC Scopus subject areas
- Clinical Neurology
- Neuroscience(all)
Cite this
Long latency postural responses are functionally modified by cognitive set. / Beckley, D. J.; Bloem, B. R.; Remler, M. P.; Roos, R. A C; Van Dijk, J. G.
In: Electroencephalography and Clinical Neurophysiology/ Evoked Potentials, Vol. 81, No. 5, 1991, p. 353-358.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Long latency postural responses are functionally modified by cognitive set
AU - Beckley, D. J.
AU - Bloem, B. R.
AU - Remler, M. P.
AU - Roos, R. A C
AU - Van Dijk, J. G.
PY - 1991
Y1 - 1991
N2 - We examined how cognitive set influences the long latency components of normal postural responses in the legs. We disturbed the postural stability of standing human subjects with sudden toe-up ankle rotations. To influence the subjects' cognitive set, we varied the rotation amplitude either predictably (serial 4° versus serial 10°) or unpredictably (random mixture of 4° and 10°). The subjects' responses to these ankle rotations were assessed from the EMG activity of the tibialis anterior, the medial gastrocnemius, and the vastus lateralis muscles of the left leg. The results indicate that, when the rotation amplitude is predictable, only the amplitude of the long latency (LL) response in tibialis anterior and vastus lateralis varied directly with perturbation size. Furthermore, when the rotation amplitude is unpredictable, the central nervous system selects a default amplitude for the LL response in the tibialis anterior. When normal subjects are exposed to 2 pertubation amplitudes which include the potential risk of falling, the default LL response in tibialis anterior appropriately anticipates the larger amplitude perturbation rather than the smaller or an intermediate one.
AB - We examined how cognitive set influences the long latency components of normal postural responses in the legs. We disturbed the postural stability of standing human subjects with sudden toe-up ankle rotations. To influence the subjects' cognitive set, we varied the rotation amplitude either predictably (serial 4° versus serial 10°) or unpredictably (random mixture of 4° and 10°). The subjects' responses to these ankle rotations were assessed from the EMG activity of the tibialis anterior, the medial gastrocnemius, and the vastus lateralis muscles of the left leg. The results indicate that, when the rotation amplitude is predictable, only the amplitude of the long latency (LL) response in tibialis anterior and vastus lateralis varied directly with perturbation size. Furthermore, when the rotation amplitude is unpredictable, the central nervous system selects a default amplitude for the LL response in the tibialis anterior. When normal subjects are exposed to 2 pertubation amplitudes which include the potential risk of falling, the default LL response in tibialis anterior appropriately anticipates the larger amplitude perturbation rather than the smaller or an intermediate one.
KW - Balance
KW - Cognitive set
KW - EMG
KW - Long-latency
KW - Motor control
KW - Posture
UR - http://www.scopus.com/inward/record.url?scp=0025917412&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025917412&partnerID=8YFLogxK
U2 - 10.1016/0168-5597(91)90024-R
DO - 10.1016/0168-5597(91)90024-R
M3 - Article
C2 - 1718721
AN - SCOPUS:0025917412
VL - 81
SP - 353
EP - 358
JO - Electroencephalography and Clinical Neurophysiology - Evoked Potentials
JF - Electroencephalography and Clinical Neurophysiology - Evoked Potentials
SN - 0168-5597
IS - 5
ER -