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Message: <blockquote data-quote="elkcub" data-source="post: 1703657" data-attributes="member: 14473">Hi Manni,I'm not aware of even anecdotal evidence that field flatness is related to the globe effect.  Are you?  It seems to be related to the amount of distortion in the optical system, as discussed in Holger Merlitz' papers.  Being a task induced phenomenon, however, we really need to examine why some people report the effect and others don't.  For starters, there are several dynamic visual sub-tasks involved in birding that probably should be differentiated, and which might or might not induce some form of disorientation, — possibly due to the globe effect.  (Note that disorientation may be induced by several other factors.)  Does "panning" involve/exclude visual search or is it simply any lateral movement of the head?  Does it involve/exclude  visual tracking of an identified target?  Does that matter?  To what extent is the perceptual effect dependent on particular textural characteristics of the visual field?  For example, is panning through foliage equivalent to panning a forest, a cityscape, a distant mountain ridge, or the night sky?    Globe effect demonstrations utilize an idealized but largely unrealistic field texture.  How many of us really live in a two-dimensional checkerboard world that we observe passively?  The paradigm is designed to isolate variables for modeling and scientific understanding, but we should exercise caution in generalizing too far.  It's a big leap, after all, from that passive checkerboard world to the highly complex 3-D environment involving visual search and dynamic tracking that the birder lives in.  Perceptual effects do not parse easily, and visually induced perceptions almost always involve the individual's oculomotor system, which has not even been discussed.  Anyway, it's just a few ideas to consider.  At this point I'm neutral about the wisdom of Swaro's design approach, but, whatever else, it's gotta be interesting.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />Ed</blockquote>

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