Limits...
Averaging, not internal noise, limits the development of coherent motion processing.

Manning C, Dakin SC, Tibber MS, Pellicano E - Dev Cogn Neurosci (2014)

Bottom Line: To this end, we presented equivalent noise direction discrimination tasks and motion coherence tasks at both slow (1.5°/s) and fast (6°/s) speeds to children aged 5, 7, 9 and 11 years, and adults.We show that, as children get older, their levels of internal noise reduce, and they are able to average across more local motion estimates.Our results suggest that the development of coherent motion sensitivity is primarily limited by developmental changes within brain regions involved in integrating motion signals (e.g., MT/V5).

View Article: PubMed Central - PubMed

Affiliation: Centre for Research in Autism and Education (CRAE), Institute of Education, University of London, 55-59 Gordon Square, Institute of Education, London WC1H 0NU, UK. Electronic address: c.manning@ioe.ac.uk.

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Standard deviations of eye positions in equivalent noise tasks (left panel) and motion coherence tasks (right panel) for slow (1.5°/s) and fast (6°/s) speed conditions. Circles show individual performance (slow: open circles; fast: filled circles) and lines represent mean performance for each age group (slow: red dotted line; fast: blue solid line). Standard deviations were log-transformed for analysis. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)
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fig0020: Standard deviations of eye positions in equivalent noise tasks (left panel) and motion coherence tasks (right panel) for slow (1.5°/s) and fast (6°/s) speed conditions. Circles show individual performance (slow: open circles; fast: filled circles) and lines represent mean performance for each age group (slow: red dotted line; fast: blue solid line). Standard deviations were log-transformed for analysis. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)

Mentions: Next, we investigated whether there were age-related changes in the ability to maintain fixation and whether these were related to task performance. The standard deviation of participants’ eye positions for each task is shown in Fig. 4. A preliminary ANOVA on standard deviations in the equivalent noise task revealed no main effect of noise condition (‘no noise’, ‘high noise’) and no interactions with age group or speed condition, and so this factor was not analysed further.


Averaging, not internal noise, limits the development of coherent motion processing.

Manning C, Dakin SC, Tibber MS, Pellicano E - Dev Cogn Neurosci (2014)

Standard deviations of eye positions in equivalent noise tasks (left panel) and motion coherence tasks (right panel) for slow (1.5°/s) and fast (6°/s) speed conditions. Circles show individual performance (slow: open circles; fast: filled circles) and lines represent mean performance for each age group (slow: red dotted line; fast: blue solid line). Standard deviations were log-transformed for analysis. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4256063&req=5

fig0020: Standard deviations of eye positions in equivalent noise tasks (left panel) and motion coherence tasks (right panel) for slow (1.5°/s) and fast (6°/s) speed conditions. Circles show individual performance (slow: open circles; fast: filled circles) and lines represent mean performance for each age group (slow: red dotted line; fast: blue solid line). Standard deviations were log-transformed for analysis. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of the article.)
Mentions: Next, we investigated whether there were age-related changes in the ability to maintain fixation and whether these were related to task performance. The standard deviation of participants’ eye positions for each task is shown in Fig. 4. A preliminary ANOVA on standard deviations in the equivalent noise task revealed no main effect of noise condition (‘no noise’, ‘high noise’) and no interactions with age group or speed condition, and so this factor was not analysed further.

Bottom Line: To this end, we presented equivalent noise direction discrimination tasks and motion coherence tasks at both slow (1.5°/s) and fast (6°/s) speeds to children aged 5, 7, 9 and 11 years, and adults.We show that, as children get older, their levels of internal noise reduce, and they are able to average across more local motion estimates.Our results suggest that the development of coherent motion sensitivity is primarily limited by developmental changes within brain regions involved in integrating motion signals (e.g., MT/V5).

View Article: PubMed Central - PubMed

Affiliation: Centre for Research in Autism and Education (CRAE), Institute of Education, University of London, 55-59 Gordon Square, Institute of Education, London WC1H 0NU, UK. Electronic address: c.manning@ioe.ac.uk.

Show MeSH
Related in: MedlinePlus