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Clinical evidence for the onset of the sensitive period in infancy
1Department of Ophthalmology, Hospital for Sick Children, London.
The British Journal of Ophthalmology
|June 1, 1992
Insights
Congenital cranial nerve palsies in neonates resolved within six weeks, indicating a critical developmental window. This suggests a six-week latent period precedes the onset of the sensitive period for visual development.
Area of Science:
- Ophthalmology
- Neuroscience
- Developmental Biology
Background:
- Congenital cranial nerve palsies and afferent visual pathway pathologies can affect neonates.
- Early visual development is crucial for long-term visual function.
Purpose of the Study:
- To investigate the visual development and recovery in neonates with specific birth-related ocular and visual pathway abnormalities.
- To determine the timing of the sensitive period for visual development in humans.
Main Methods:
- Case study of seven neonates presenting with third (IIIrd) or sixth (VIth) nerve palsy or afferent visual pathway pathology at birth.
- Longitudinal follow-up to assess visual acuity, motor fusion, and stereopsis recovery.
Main Results:
- All seven neonates experienced spontaneous resolution of their initial abnormalities within six weeks.
- Following resolution, all children achieved normal visual acuity, motor fusion, and stereopsis.
- The observed recovery pattern suggests a specific timeline for visual system plasticity.
Conclusions:
- A latent period of approximately six weeks exists before the onset of the sensitive period for visual development in humans.
- Early-onset visual pathway abnormalities in neonates may have a favorable prognosis if they resolve within this latent period.
- This finding has implications for understanding critical periods in neurodevelopment and potential interventions.
Abstract:
Seven neonates had a IIIrd or VIth nerve palsy or afferent visual pathway pathology at birth. These abnormalities resolved within 6 weeks and the children have developed normal visual acuity, motor fusion, and stereopsis. We conclude that there is a latent period of 6 weeks before the onset of the sensitive period.