| 1. |
- Ekberg, Therese L., et al.
(författare)
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Dynamic reaching in infants during binocular and monocular viewing
- 2013
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 229:1, s. 1-12
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Tidskriftsartikel (refereegranskat)abstract
- This study examined reaching in 6-, 8-, and 10-month-olds during binocular and monocular viewing in a dynamic reaching situation. Infants were rotated toward a flat vertical board and reached for objects at one of seven positions along a horizontal line at shoulder height. Hand selection, time to contact the object, and reaching accuracy were examined in both viewing conditions. Hand selection was strongly dependent on object location, not on infants' age or whether one eye was covered. Monocular viewing and age did, however, affect time to object contact and contact errors: Infants showed longer contact times when one eye was covered, and 6-month-olds made more contact errors in the monocular condition. For right-hand selection, contact times were longer when the covered right eye was leading during the chair rotation. For left-hand selection, there were no differences in contact time due to whether the covered eye was leading during rotation.
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| 2. |
- Gredebäck, Gustaf, et al.
(författare)
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The development of reactive saccade latencies
- 2006
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 173:1, s. 159-164
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Tidskriftsartikel (refereegranskat)abstract
- Saccadic reaction time (SRT) of 4-, 6- and 8-month-old infants' was measured during tracking of abruptly changing trajectories, using a longitudinal design. SRTs decreased from 595 ms (SE=30) at 4 months of age to 442 ms (SE=13) at 8 months of age. In addition, SRTs were lower during high velocities (comparing 4.5 and 9 degrees/s) and vertical (compared to horizontal) saccades.
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| 3. |
- Gredebäck, Gustaf, et al.
(författare)
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The development of two-dimensional tracking : a longitudinal study of circular pursuit
- 2005
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 163:2, s. 204-213
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Tidskriftsartikel (refereegranskat)abstract
- We investigated 6- to 12-month-old infants’ ability to track an object moving on circular trajectories, using a longitudinal design. Consistent predictive gaze tracking was not found before 8 months of age. These results indicate that infants’ horizontal and vertical components of circular tracking are less mature than expected from previous studies of one-dimensional horizontal tracking. Vertical components are especially immature, particularly during high velocity tracking (~20°/s). The results also suggest that horizontal and vertical tracking are mutually dependent during early development. Saccades were predictive (average lag >−125 ms) from 6 months onwards.
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| 4. |
- Grönqvist, Helena, et al.
(författare)
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Reaching strategies of very preterm infants at 8 months corrected age
- 2011
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 209:2, s. 225-233
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Tidskriftsartikel (refereegranskat)abstract
- Reaching strategies and kinematics for a group of very preterm infants were investigated and compared with a group of full-term infants when reaching for a moving object. Eight-month-old (corrected-age) infants were presented with small toys moving on a semicircular path in the vertical plane. The trajectories of the target and the hands of the infants were measured using a 3D motion analysis system. No differences were found in how often the infants encountered the target. The very preterm group, however, used bimanual strategies more often and had more curved reaching paths than the full-term group. These results suggest that very preterm infants are equally successful as healthy full-term infants in catching a moving object but their reaching strategies are less efficient compared with full-term infants at 8 months (corrected age).
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| 5. |
- Rosander, Kerstin, et al.
(författare)
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Development of gaze tracking of small and large objects
- 2002
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 146:2, s. 257-264
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Tidskriftsartikel (refereegranskat)abstract
- A longitudinal study was designed to address the relationships between the smooth pursuit (SP) and the optokinetic response (OKR). Eye and head movements were measured in infants between 7 and 14 weeks of age. They were placed in front of a moving object subtending visual angles of 2.5, 5, 7, 14, 21, 28, and 35°. The object oscillated sinusoidally along a horizontal path with a frequency of 0.25 Hz and an amplitude of ±25° visual angle. It was found that the number of saccades was dependent on object size: at 6 and 9 weeks of age there were more saccades for the smallest objects. With increasing age, the number of saccades decreased. The composite eye movement gain (smooth tracking + saccades) did not change with age but for the 6.5-week group the gain was higher for smaller objects. The gain of the smooth eye tracking increased with age and showed no dependency on object size. In conclusion, the results do not support the concept of two separate systems, the OKR and the SP, each of them processing eye tracking of small and large objects. Finally, it was observed that two infants at 6.5 weeks of age who used considerable head movements did not inhibit the vestibular-ocular response.
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| 6. |
- Rosander, K, et al.
(författare)
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Visual-vestibular interaction in early infancy
- 2000
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Ingår i: EXPERIMENTAL BRAIN RESEARCH. - 0014-4819. ; 133:3, s. 321-333
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Tidskriftsartikel (refereegranskat)abstract
- The development of visual and vestibular control of smooth gaze adjustments was studied longitudinally in 3- to 18-week-old infants. Eye and head movements were measured with electro-oculography (EOG) and an optoelectronic system, respectively. The infant
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