Chelle Roberts
@chellemroberts
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PhD Student • UNSW, Sydney • Visual Processing, Preference, Restoration & Natural Scene Statistics • Spehar Lab • Loves Nature & Beer, often paired •
Wollongong, New South Wales
Joined May 2014
Great fun to be interviewed live by @BoilingPointFM! Check it out to hear about my research on visual processing, restoration, and nature scenes (ft. a story about my time in the Amazon jungle 🦎🐜🦋).
Chelle (@chelle__roberts) came all the way from Wollongong to come to our show! . Listen into the episode with your host, @itsstasi, on the psychology behind vision! . Listen here:| annd all platforms. Also check out the blog:
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Thank you for reading this Twitter thread! . All the data, code, and stimuli are freely available on the @OSFramework: Many thanks to my collaborators @zoeyisherwood, @mschira, Branka Spehar, and @BonJovi.
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Our findings suggest that visual discrimination depends more on scene structure than fine luminance variations in nature. This makes sense when we think about the dynamic world around us - light shifts and changes throughout the day, but structure remains stable. 📷: Jan Huber
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Interestingly, performance between the movie types was the same - even though the thresholded movies had vastly different fine luminance variations. There was no significant difference in discrimination performance.
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To test this, we presented these movies to participants who performed an ‘odd-one-out’ discrimination task; the better their performance, the harder the task became. Note: Movie Type and 1/f slope only differed between blocks, not within.
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We generated greyscale movies across a range of 1/f slope values in space and time, then thresholded them, removing most of the fine luminance variations. Both sets have similar structural information, but their *photometric* information differs dramatically—does the eye care?
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Excited to share my new paper in the Journal of Vision! 👀 @ARVOJOV. When we look at the world around us, what does our vision rely on? . We used greyscale and thresholded noise movies to test whether fine luminance variation or scene structure is most important to the eye. 🧵
Michelle M. Roberts, et al found that human neural processes may have evolved to be sensitive to structure – the most stable signal in our natural environment.
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Some more interesting research on colour perception from @zoeyisherwood.
Check out our latest paper out in JOV (@ARVOJOV) 👁. “Surface properties and the perception of color”. We measured how perceived saturation and lightness depend on light source orientation and 3D surface properties across three surface hues: . red 🔴 green 🟢 and blue 🔵. 1/🧵.
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RT @zoeyisherwood: ✨ Check out my latest paper in Vision Research ✨ . We measured discrimination sensitivity and visual preference toward n….
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Check out our recent research on fractal structure and visual perception! Presented at Virtual-VSS 2020.
How is fractal structure processed by the visual system? Check out my poster at V-VSS 2020 to find out!. Poster: Video walkthrough: Q&A times on Zoom with @chelle__roberts: June 19, 2pm June 23, 12pm & 11pm PST (DM for links!)
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