August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
Dissociating higher-order visual processing in typical and atypical development
Author Affiliations
  • Nevena Simic
    Psychology, University of Toronto
    Neurosciences and Mental Health, The Hospital for Sick Children
  • Joanne Rovet
    Neurosciences and Mental Health, The Hospital for Sick Children
Journal of Vision August 2010, Vol.10, 457. doi:10.1167/10.7.457
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      Nevena Simic, Joanne Rovet; Dissociating higher-order visual processing in typical and atypical development. Journal of Vision 2010;10(7):457. doi: 10.1167/10.7.457.

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Abstract

Background: Research with adults has established that higher-order visual information is processed along two functionally specialized pathways: a ventral stream and a dorsal stream. Surprisingly, however, less is known about how this dissociation emerges and matures during development. The present study (1) investigated typical development of higher-order visual processes and (2) determined whether the developmental trajectories of these visual processes differed for atypically developing individuals. Methods: In Experiment 1, 30 typically developing adolescents (age 10-16 years) completed four computerized experimental paradigms designed to differentially draw on dorsal or ventral processing resources. These tasks required participants to (a) either decide if two abstract shapes match (ventral task) or fit together (dorsal task) or (b) either pay attention to the identity (ventral) or the location (dorsal) of drawings of buildings, upright faces, and inverted faces. Results show no association between age and accuracy, but reaction times were negatively correlated with age. These relationships held for both dorsal and ventral tasks. Data are compared with accuracy and reaction time results from young adults (age 18-25 years). In Experiment 2, the same computer tasks were completed by a group of atypically developing children with congenital hypothyroidism (CH), a paediatric endocrine disorder caused by lack of thyroid hormone (TH) that is present at birth. TH is a critical endocrine modulator of normal brain development known to affect development of the visual system. CH had significantly poorer accuracy scores on both ventral and dorsal tasks, but were also significantly slower to judge identity than controls. Conclusions: First, our findings suggest that there is very little development in the dorsal and ventral pathways after ten years of age in typically developing individuals, although processing speed does increase with age. Secondly, TH insufficiency during gestation is associated with impairments in higher-order visual processing in adolescence.

Simic, Rovet, (2010). Dissociating higher-order visual processing in typical and atypical development [Abstract]. Journal of Vision, 10(7):457, 457a, http://www.journalofvision.org/content/10/7/457, doi:10.1167/10.7.457. [CrossRef]
Footnotes
 March of Dimes, Vision Sciences Research Program.
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