Asymmetrical cortical processing of radial expansion/contraction in infants and adults.
We report asymmetrical cortical responses (steady-state visual evoked potentials) to radial expansion and contraction in human infants and adults. Forty-four infants (22 3-month-olds and 22 4-month-olds) and nine adults viewed dynamic dot patterns which cyclically (2.1 Hz) alternate between radial e...
| Auteurs principaux: | , , , , , , |
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| Format: | Journal article |
| Langue: | English |
| Publié: |
2009
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| _version_ | 1826272101752897536 |
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| author | Shirai, N Birtles, D Wattam-Bell, J Yamaguchi, M Kanazawa, S Atkinson, J Braddick, O |
| author_facet | Shirai, N Birtles, D Wattam-Bell, J Yamaguchi, M Kanazawa, S Atkinson, J Braddick, O |
| author_sort | Shirai, N |
| collection | OXFORD |
| description | We report asymmetrical cortical responses (steady-state visual evoked potentials) to radial expansion and contraction in human infants and adults. Forty-four infants (22 3-month-olds and 22 4-month-olds) and nine adults viewed dynamic dot patterns which cyclically (2.1 Hz) alternate between radial expansion (or contraction) and random directional motion. The first harmonic (F1) response in the steady-state VEP response must arise from mechanisms sensitive to the global radial motion structure. We compared F1 amplitudes between expansion-random and contraction-random motion alternations. F1 amplitudes for contraction were significantly larger than those for expansion for the older infants and adults but not for the younger infants. These results suggest that the human cortical motion mechanisms have asymmetrical sensitivity for radial expansion vs. contraction, which develops at around 4 months of age. The relation between development of sensitivity to radial motion and cortical motion mechanisms is discussed. |
| first_indexed | 2024-03-06T22:07:13Z |
| format | Journal article |
| id | oxford-uuid:50926373-7455-4740-94ad-269a2da84861 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:07:13Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:50926373-7455-4740-94ad-269a2da848612022-03-26T16:14:20ZAsymmetrical cortical processing of radial expansion/contraction in infants and adults.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:50926373-7455-4740-94ad-269a2da84861EnglishSymplectic Elements at Oxford2009Shirai, NBirtles, DWattam-Bell, JYamaguchi, MKanazawa, SAtkinson, JBraddick, OWe report asymmetrical cortical responses (steady-state visual evoked potentials) to radial expansion and contraction in human infants and adults. Forty-four infants (22 3-month-olds and 22 4-month-olds) and nine adults viewed dynamic dot patterns which cyclically (2.1 Hz) alternate between radial expansion (or contraction) and random directional motion. The first harmonic (F1) response in the steady-state VEP response must arise from mechanisms sensitive to the global radial motion structure. We compared F1 amplitudes between expansion-random and contraction-random motion alternations. F1 amplitudes for contraction were significantly larger than those for expansion for the older infants and adults but not for the younger infants. These results suggest that the human cortical motion mechanisms have asymmetrical sensitivity for radial expansion vs. contraction, which develops at around 4 months of age. The relation between development of sensitivity to radial motion and cortical motion mechanisms is discussed. |
| spellingShingle | Shirai, N Birtles, D Wattam-Bell, J Yamaguchi, M Kanazawa, S Atkinson, J Braddick, O Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title | Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title_full | Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title_fullStr | Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title_full_unstemmed | Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title_short | Asymmetrical cortical processing of radial expansion/contraction in infants and adults. |
| title_sort | asymmetrical cortical processing of radial expansion contraction in infants and adults |
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