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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Schematic representation of stimuli presented in the ‘high noise’ condition of the equivalent noise task (A) and the motion coherence task (B). The anchor-shaped fixation point, central yellow aperture and green (left) and red (right) “reefs” or “rocks” remained on the screen throughout the trial.
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fig0010: Schematic representation of stimuli presented in the ‘high noise’ condition of the equivalent noise task (A) and the motion coherence task (B). The anchor-shaped fixation point, central yellow aperture and green (left) and red (right) “reefs” or “rocks” remained on the screen throughout the trial.

Mentions: A yellow-bordered circular aperture (diameter = 15°) and anchor-shaped fixation point (0.57 × 0.57°) were presented against a grey background with a luminance of 30 cd/m2 (see Fig. 2). Two smaller yellow-bordered circular apertures (diameter = 6.12°) were presented to the left and right of this, serving as reference points for the reporting of motion direction. In the equivalent noise task, the left and right apertures were presented in the top corners of the screen and contained images of red and green reefs, respectively (see Fig. 2A). In the motion coherence task, the left and right apertures were presented halfway down the screen, containing images of red and green rocks, respectively (see Fig. 2B).


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

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

Schematic representation of stimuli presented in the ‘high noise’ condition of the equivalent noise task (A) and the motion coherence task (B). The anchor-shaped fixation point, central yellow aperture and green (left) and red (right) “reefs” or “rocks” remained on the screen throughout the trial.
© Copyright Policy
Related In: Results  -  Collection

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

fig0010: Schematic representation of stimuli presented in the ‘high noise’ condition of the equivalent noise task (A) and the motion coherence task (B). The anchor-shaped fixation point, central yellow aperture and green (left) and red (right) “reefs” or “rocks” remained on the screen throughout the trial.
Mentions: A yellow-bordered circular aperture (diameter = 15°) and anchor-shaped fixation point (0.57 × 0.57°) were presented against a grey background with a luminance of 30 cd/m2 (see Fig. 2). Two smaller yellow-bordered circular apertures (diameter = 6.12°) were presented to the left and right of this, serving as reference points for the reporting of motion direction. In the equivalent noise task, the left and right apertures were presented in the top corners of the screen and contained images of red and green reefs, respectively (see Fig. 2A). In the motion coherence task, the left and right apertures were presented halfway down the screen, containing images of red and green rocks, respectively (see Fig. 2B).

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