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: https://t.co/NcT5BtDCH7 | annd all platforms Also check out the blog: https://t.co/m7mZIVU3EW
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Thank you for reading this Twitter thread! All the data, code, and stimuli are freely available on the @OSFramework: https://t.co/KopHEgqtJc 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. https://t.co/uNuXX97M0K
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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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✨ Check out my latest paper in Vision Research ✨ We measured discrimination sensitivity and visual preference toward naturalistic noise stimuli varying in their 1/f amplitude spectra in space *and* time https://t.co/wjmxtgykWY (1/🧵)
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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: https://t.co/B7WN7eOpRA Video walkthrough: https://t.co/UPz6F97DC8 Q&A times on Zoom with @chelle__roberts: June 19, 2pm June 23, 12pm & 11pm PST (DM for links!)
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