Eye-head coordination for the steering of locomotion in humans: an anticipatory synergy

Grasso, R.; Prévost, Pascal; Ivanenko, Yuri P.; Berthoz, Alain

doi:10.1016/s0304-3940(98)00625-9

Cited by 205 publications

(170 citation statements)

References 10 publications

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“…4, the results from our study correspond well with studies that used heading as a reference (Grasso et al 1998;Imai et al 2001;Prévost et al 2002) as well as with those that used the trunk/pelvis (Hicheur et al 2007;Solomon et al 2006). A similar trend of increasing relative yaw for turns of higher angles was also reported in a recent study by Hicheur et al (2007) although their task and setup were very diVerent from those in our study.…”

Section: Relative Head Yaw During Turnssupporting

confidence: 91%

“…The Wrst reference is the heading, which is calculated using consecutive head positions (e.g. Courtine and Schieppati 2003;Grasso et al 1996Grasso et al , 1998Hicheur et al 2005aHicheur et al , 2007Imai et al 2001;Prévost et al 2002). The second reference is the orientation of the trunk/pelvis (Hicheur et al 2007;Solomon et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…This seemingly trivial task of walking along curved paths actually involves a complex interplay between the diVerent parts of our body-the extremities, the trunk, the head and the eyes (e.g. Courtine and Schieppati 2003;Grasso et al 1996Grasso et al , 1998Imai et al 2001;Patla et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have found that the head starts to turn into the direction of the turn 0.2-0.6 s before the trunk does (Courtine and Schieppati 2003;Grasso et al 1996Grasso et al , 1998Prévost et al 2002). It has been suggested that this happens in order to gather advance visual information about the environment and obstacles that lie in the future walking path (Grasso et al 1996(Grasso et al , 1998Hicheur et al 2005a;Hollands et al 2001;Patla et al 1999;Prévost et al 2002). Prévost et al (2002) had participants make 90° turns with diVerent walking speeds and showed that the head turns at a constant distance rather than a constant time to the corner.…”

Section: Introductionmentioning

confidence: 99%

“…The maximum oVset between head orientation and walking direction is in the range of 20°-40° (e.g. Courtine and Schieppati 2003;Grasso et al 1996Grasso et al , 1998Hicheur et al 2005aHicheur et al , 2007Imai et al 2001;Prévost et al 2002), while that between head and trunk/pelvis orientation is 10°-15° ( Hicheur et al 2007;Solomon et al 2006). However, since most of these studies have used turns within a restricted range around 90°, it is unclear whether the relationship between head and trunk orientation depends on the size of the turn.…”

Section: Introductionmentioning

confidence: 99%

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Walking along curved paths of different angles: the relationship between head and trunk turning

et al. 2008

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Walking along a curved path requires coordinated motor actions of the entire body. Here, we investigate the relationship between head and trunk movements during walking. Previous studies have found that the head systematically turns into turns before the trunk does. This has been found to occur at a constant distance rather than at a constant time before a turn. We tested whether this anticipatory head behavior is spatially invariant for turns of diVerent angles. Head and trunk positions and orientations were measured while participants walked around obstacles in 45°, 90°, 135° or 180° turns. The radius of the turns was either imposed or left free. We found that the head started to turn into the direction of the turn at a constant distance before the obstacle (»1.1 m) for turn angles up to 135°. During turns, the head was consistently oriented more into the direction of the turn than the trunk. This diVerence increased for larger turning angles and reached its maximum later in the turn for larger turns. Walking speeds decreased monotonically for increasing turn angles. Imposing Wxed turn radii only aVected the point at which the trunk started to turn into a turn. Our results support the view that anticipatory head movements during turns occur in order to gather advance visual information about the trajectory and potential obstacles.

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Section: Relative Head Yaw During Turnssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Walking along curved paths of different angles: the relationship between head and trunk turning

et al. 2008

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Head‐pelvis coupling is increased during turning in patients with Parkinson's disease and freezing of gait

et al. 2013

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Turning is the most important trigger for freezing of gait (FOG). The aim of this study was to investigate the relationship between impaired head-pelvis rotation during turning and FOG. Head, trunk, and pelvic rotation were measured at onset and throughout a 180-degree turn in 13 freezers and 14 nonfreezers (OFF medication). We also studied 14 controls at preferred and slow speed to investigate the influence of turn velocity on axial rotation. Location and duration of FOG episodes were defined during the turn. At turning onset, head rotation preceded thorax and pelvic rotation in all groups, but this craniocaudal sequence disappeared when FOG occurred. Maximum head-pelvis separation was significantly greater in controls, compared to freezers and nonfreezers (35.4 versus 25.7 and 27.3 degrees; P < 0.01), but this finding was speed dependent. Timing of maximum head-pelvis separation was delayed in freezers, compared to nonfreezers and controls, irrespective of turn velocity. This delay was correlated with increased neck rigidity (R = 0.62; P = 0.02) and worsened during FOG trials. FOG occurred more often at the end of the turn, when difference in rotation velocity between head and pelvis was greatest. Even after controlling for speed and disease severity, turning in freezers was characterized by delayed head rotation and a closer coupling between head and pelvis, especially in turns where FOG occurred. These changes may be attributed to delayed preparation for the change in walking direction and, as such, contribute to FOG. © 2013 Movement Disorder Society.

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Investigating Head and Trunk Rotation in Sitting: A Pilot Study Comparing People after Stroke and Healthy Controls

Verheyden

Ashburn

Burnett

et al. 2011

Physiotherapy Res Intl

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Healthy participants (two women and four men; mean age 66 years) showed significant rotation of the head before rotation of the shoulders at all three time points; people with stroke (one woman and five men; mean age 71 years) did not show this top-down pattern of movement. There was no significant difference between start times of head and shoulder rotation at 3 (p = 0.167), 6 (p = 0.084) and 12 weeks after stroke (p = 0.062). Conclusions. The results of our pilot study warrant further investigation into the recovery and pattern of axial coordination after stroke. Future studies could provide insight into the mechanisms behind impaired postural control in people after stroke.

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Eye-head coordination for the steering of locomotion in humans: an anticipatory synergy

Cited by 205 publications

References 10 publications

Walking along curved paths of different angles: the relationship between head and trunk turning

Walking along curved paths of different angles: the relationship between head and trunk turning

Head‐pelvis coupling is increased during turning in patients with Parkinson's disease and freezing of gait

Investigating Head and Trunk Rotation in Sitting: A Pilot Study Comparing People after Stroke and Healthy Controls

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