Abstract
In human and animal locomotion, sensory input is thought to be processed in a phase-dependent manner. Here we use full-field transient visual scene motion toward or away from subjects walking on a treadmill. Perturbations were presented at three phases of walking to test 1) whether phase dependence is observed for visual input and 2) whether the nature of phase dependence differs across body segments. Results demonstrated that trunk responses to approaching perturbations were only weakly phase dependent and instead depended primarily on the delay from the perturbation. Recording of kinematic and muscle responses from both right and left lower limb allowed the analysis of six distinct phases of perturbation effects. In contrast to the trunk, leg responses were strongly phase dependent. Leg responses during the same gait cycle as the perturbation exhibited gating, occurring only when perturbations were applied in midstance. In contrast, during the postperturbation gait cycle, leg responses occurred at similar response phases of the gait cycle over a range of perturbation phases. These distinct responses reflect modulation of trunk orientation for upright equilibrium and modulation of leg segments for both hazard accommodation/avoidance and positional maintenance on the treadmill. Overall, these results support the idea that the phase dependence of responses to visual scene motion is determined by different functional tasks during walking.
| Original language | English |
|---|---|
| Pages (from-to) | 165-180 |
| Number of pages | 16 |
| Journal | Journal of Neurophysiology |
| Volume | 112 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 1 2014 |
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Keywords
- Human locomotion
- Phase dependence
- Vision
ASJC Scopus subject areas
- Physiology
- Neuroscience(all)
- Medicine(all)
Cite this
Function dictates the phase dependence of vision during human locomotion. / Logan, David; Ivanenko, Yuri P.; Kiemel, Tim; Cappellini, Germana; Sylos-Labini, Francesca; Lacquaniti, Francesco; Jeka, John J.
In: Journal of Neurophysiology, Vol. 112, No. 1, 01.07.2014, p. 165-180.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Function dictates the phase dependence of vision during human locomotion
AU - Logan, David
AU - Ivanenko, Yuri P.
AU - Kiemel, Tim
AU - Cappellini, Germana
AU - Sylos-Labini, Francesca
AU - Lacquaniti, Francesco
AU - Jeka, John J.
PY - 2014/7/1
Y1 - 2014/7/1
N2 - In human and animal locomotion, sensory input is thought to be processed in a phase-dependent manner. Here we use full-field transient visual scene motion toward or away from subjects walking on a treadmill. Perturbations were presented at three phases of walking to test 1) whether phase dependence is observed for visual input and 2) whether the nature of phase dependence differs across body segments. Results demonstrated that trunk responses to approaching perturbations were only weakly phase dependent and instead depended primarily on the delay from the perturbation. Recording of kinematic and muscle responses from both right and left lower limb allowed the analysis of six distinct phases of perturbation effects. In contrast to the trunk, leg responses were strongly phase dependent. Leg responses during the same gait cycle as the perturbation exhibited gating, occurring only when perturbations were applied in midstance. In contrast, during the postperturbation gait cycle, leg responses occurred at similar response phases of the gait cycle over a range of perturbation phases. These distinct responses reflect modulation of trunk orientation for upright equilibrium and modulation of leg segments for both hazard accommodation/avoidance and positional maintenance on the treadmill. Overall, these results support the idea that the phase dependence of responses to visual scene motion is determined by different functional tasks during walking.
AB - In human and animal locomotion, sensory input is thought to be processed in a phase-dependent manner. Here we use full-field transient visual scene motion toward or away from subjects walking on a treadmill. Perturbations were presented at three phases of walking to test 1) whether phase dependence is observed for visual input and 2) whether the nature of phase dependence differs across body segments. Results demonstrated that trunk responses to approaching perturbations were only weakly phase dependent and instead depended primarily on the delay from the perturbation. Recording of kinematic and muscle responses from both right and left lower limb allowed the analysis of six distinct phases of perturbation effects. In contrast to the trunk, leg responses were strongly phase dependent. Leg responses during the same gait cycle as the perturbation exhibited gating, occurring only when perturbations were applied in midstance. In contrast, during the postperturbation gait cycle, leg responses occurred at similar response phases of the gait cycle over a range of perturbation phases. These distinct responses reflect modulation of trunk orientation for upright equilibrium and modulation of leg segments for both hazard accommodation/avoidance and positional maintenance on the treadmill. Overall, these results support the idea that the phase dependence of responses to visual scene motion is determined by different functional tasks during walking.
KW - Human locomotion
KW - Phase dependence
KW - Vision
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UR - http://www.scopus.com/inward/citedby.url?scp=84903614685&partnerID=8YFLogxK
U2 - 10.1152/jn.01062.2012
DO - 10.1152/jn.01062.2012
M3 - Article
C2 - 24717345
AN - SCOPUS:84903614685
VL - 112
SP - 165
EP - 180
JO - Journal of Neurophysiology
JF - Journal of Neurophysiology
SN - 0022-3077
IS - 1
ER -