David N. Profile

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$35 USD / hour

pincourt,

canada

$35 USD / hour

It's currently 2:36 AM here

Joined February 14, 2017

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David N.

@davidnguyentri

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(0 reviews)

0.0

$35 USD / hour

pincourt,

canada

$35 USD / hour

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Scientific consultant

I am a seasoned and talented research professional with a solid track record for delivering high quality deliverables within project timelines and budgets. I am proficient at scientific writing (grant proposals, scientific papers, reports), data entry, processing, and analysis, as well as programming (C++, C#, Matlab). In addition, I am attentive to project requirements and work hard to satisfy my clients.

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Publications

The perceived speed of drifting chromatic gratings is mechanism-dependent.

Vision Research

Previous work has reported that the apparent motion of equiluminant chromatic stimuli appears decayed (i.e., slowed down and less fluid) relative to the motion of luminance modulated stimuli. Work on chromatic motion has focussed primarily on the red-green mechanism. We investigated and compared motion perception with stimuli stimulating the red-green and blue-yellow mechanism. Results show that motion perception is even more severely decayed with the blue-yellow mechanism.

The fluttering-heart illusion: a new hypothesis.

Perception

The fluttering-heart illusion is a perceived lagging behind of a colour target on a background of a different colour when the two are oscillated together. It has been proposed that the illusion is caused by a differential in the perceptual latencies of different colours, a differential in rod-cone latencies and rod-cone interactions This work explores the possibility that the effect is attributable to a difference in the perceived speeds of chromatic and achromatic motion.

The role of lenticular senescence in age-related color vision changes.

Invest Ophthalmol Vis Sci.

This work investigates the cause for the preferential age-related decrease in luminous efficiency to short wavelength light. Participants performed minimum-motion photometry and motion-nulling in order to determine the extent to which this age-related change is due to the changing optical properties of the eye, change in photoreceptors, or changes in post-receptoral procsessing. Results suggest that optical factors, particularly ageing of the human lens, is the main factor.

Luminance texture increases perceived speed.

Vision Research

Previous experiments have demonstrated that various factors can influence the apparent speed of visual stimuli. This works investigates the effects of superimposing static luminance texture on the apparent speed of a drifting grating. A series of experiments were performed to assess the effect of superimposing luminance texture on the perceived speed of a drifting grating. We discuss the research findings in the context of models proposed to account for phenomena in the perception of speed.