کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6203222 1263369 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of radial optic flow pattern sensitivity at different speeds
ترجمه فارسی عنوان
توسعه حساسیت الگوی جریان شعاعی در سرعت های مختلف
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
چکیده انگلیسی


- Global radial optic flow sensitivity varies with age and dot speed.
- Performance improves gradually but is still immature at 16 years of age.
- Both children and adults showed better sensitivity to faster than slower speed.

The development of sensitivity to radial optic flow discrimination was investigated by measuring motion coherence thresholds (MCTs) in school-aged children at two speeds. A total of 119 child observers aged 6-16 years and 24 young adult observers (23.66 +/− 2.74 years) participated. In a 2AFC task observers identified the direction of motion of a 5° radial (expanding vs. contracting) optic flow pattern containing 100 dots with 75% Michelson contrast moving at 1.6°/s and 5.5°/s and. The direction of each dot was drawn from a Gaussian distribution whose standard deviation was either low (similar directions) or high (different directions). Adult observers also identified the direction of motion for translational (rightward vs. leftward) and rotational (clockwise vs. anticlockwise) patterns. Motion coherence thresholds to radial optic flow improved gradually with age (linear regression, p < 0.05), with different rates of development at the two speeds. Even at 16 years MCTs were higher than that for adults (independent t-tests, p < 0.05). Both children and adults had higher sensitivity at 5.5°/s compared to 1.6°/s (paired t-tests, p < 0.05). Sensitivity to radial optic flow is still immature at 16 years of age, indicating late maturation of higher cortical areas. Differences in sensitivity and rate of development of radial optic flow at the different speeds, suggest that different motion processing mechanisms are involved in processing slow and fast speeds.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 110, Part A, May 2015, Pages 68-75
نویسندگان
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