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<span style="font-weight: normal;"><span style="font-size:12.0pt; font-family:"Times New Roman",serif">Please find below our advertisement for the next Vaegan seminar at UNSW Sydney. All interested attendees should RSVP via email to
<a href="mailto:juno.kim@unsw.edu.au" target="_blank" rel="noopener noreferrer">juno.kim@unsw.edu.au</a> for the meeting password. Many thanks!<br>
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<b><span lang="EN-GB">Title:</span></b></p>
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The BOLD tuning of early visual cortex to the 1/f¦Á amplitude spectrum in space and time</p>
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<b><span lang="EN-GB">Date/Time:</span></b></p>
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<span lang="EN-GB">1-2pm AEST on Friday 10 July 2020 <br>
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<b><span lang="EN-GB">Location: relevant meeting links to <span><span>seminar</span></span></span></b></p>
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<i><u><span lang="EN-GB">MEETING VIA ZOOM</span></u></i></p>
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<i><span lang="EN-GB">Topic: Vaegan seminar: Dr Zoey Isherwood (University of Nevada)</span></i></p>
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<i><span lang="EN-GB">Time: Jul 10, 2020 01:00 PM Canberra, Melbourne, Sydney </span>
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<i><span lang="EN-GB">Join from PC, Mac, Linux, iOS or Android: <br>
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<i><span lang="EN-GB"></span></i><span lang="EN-GB"><a href="https://unsw.zoom.us/j/98165705638" id="LPlnk685286">https://unsw.zoom.us/j/98165705638</a></span><i><span lang="EN-GB"><br>
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<i><span lang="EN-GB">Or iPhone one-tap:<span> </span>13126266799,98165705638# or 13462487799,98165705638#</span></i>
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<i><span lang="EN-GB">Or Telephone:</span></i></p>
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<i><span lang="EN-GB"><span> </span>Dial: +1 312 626 6799 (US Toll) or +1 346 248 7799 (US Toll)</span></i></p>
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<i><span lang="EN-GB"><span> </span>Meeting ID: 981 6570 5638 </span></i></p>
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<i><span lang="EN-GB"><span> </span>International numbers available: https://unsw.zoom.us/u/aci7VDVCd
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<span lang="EN-GB"><b>Abstrast:</b></span>
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<span style="font-size:12pt; font-family:"Times New Roman",serif,serif,EmojiFont">Natural scenes vary considerably¡ªforests and canyons for instance do not share an obvious physical property that make them ¡°natural¡±. However, across natural scenes a common distribution
of amplitude variations exists across spatial and temporal scales called the 1/f¦Á amplitude spectrum (¦Á ¡Ö 0.6¡ª1.6). This property is also considered to underlie the scale-invariant, fractal properties of natural scenes. Since the visual system has evolved
in a natural environment, it is theorised to be optimally tuned to the statistical regularities present in nature. However, the neural response to natural spatial and temporal frequency distributions has not been explored in great detail. To address this,
as part of my research I have investigated the pattern of responses in early visual cortex (V1 ¨C V4) to random noise movies that varied in their spatial (¦Á = 0.25, 1.25, 2.25) and temporal (¦Á = 0.25, 0.75, 1.25, 1.75, 2.25) amplitude spectra. Participants
were scanned using fMRI while viewing the stimuli, and maximal BOLD activity was observed for stimuli within the natural spatiotemporal range (¦Á = 0.75 and 1.25). These results suggest that early visual cortex is optimally tuned to process stimuli with natural
1/f¦Á frequency distributions in space and time, reinforcing the theory that the visual system has evolved to become tuned to the statistical properties present in our natural environment.</span></p>
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<b><span style="font-size:12pt; font-family:"Times New Roman",serif,serif,EmojiFont">Speaker biography:</span></b></p>
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<span style="font-size:12pt; font-family:"Times New Roman",serif,serif,EmojiFont"><span lang="EN-GB">Dr
</span>Zoey Isherwood is a Postdoctoral Scholar at the University of Nevada, Reno. Her research has so far focused the aesthetic appreciation and visual processing of natural statistical properties¡ªspecifically the 1/f¦Á amplitude spectrum. She received her
PhD at UNSW Sydney under the supervision of Prof. Branka Spehar and Dr. Mark Schira.<br>
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