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mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} </style> <![endif]--><!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1027"/> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1"/> </o:shapelayout></xml><![endif]--> </head> <body bgcolor=white lang=EN-US link=blue vlink=purple style='tab-interval:36.0pt'> <div class=WordSection1> <p><span style='font-size:18.0pt;color:maroon'>Research Interests</span><o:p></o:p></p> <div class=MsoNormal align=center style='text-align:center'><span style='mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"'> <hr size=8 width="90%" noshade style='color:maroon' align=center> </span></div> <p>My three primary research interests are as follows:</p> <p><b><u>Visual Direction</u>. </b>How one judges the visual direction of an object in space is described formally and elegantly by <span class=SpellE>Wells's</span> (1792) propositions and by <span class=SpellE>Hering's</span> (1879/1942) principles of visual direction. Although not all of our work on visual direction results directly from the propositions or the principles, the majority can be delineated from them. Currently, we are exploring how the visual system processes the directions of objects contained in <span class=SpellE>monocularly</span> seen areas, and the consequences of the ways in which these areas are processed. These <span class=SpellE>monocularly</span> seen areas have received some attention in the stereopsis literature, but they have received very little attention in the visual direction and the shape perception literature, despite the problem having been delineated in what is now known as Leonardo da Vinci's constraint.</p> <p><b><u>Motion Parallax</u>. </b>Early visual scientists were aware of the usefulness of motion <span class=GramE>parallax</span> as a cue to depth and recently, interest in this area has been revived. One reason for the upsurge of work in this area is a new technique to study motion parallax. It consists of yoking dot movements to lateral head movements, and is analogous to the random dot stereogram. Currently, we are examining the relationship between visual stability and the perception of <span class=SpellE>parallactic</span> depth. The technique we are using provides an ideal stimulus to examine, simultaneously, visual stability or location constancy and <span class=SpellE>parallactic</span> depth perception. This is so, because the lack of stability can be inferred from concomitant motion, which is the illusory motion of objects that occurs concomitantly with head motion.</p> <p><b><u>Visual Stability</u>. </b>We have begun new research on how the visual world remains stable when we move our head and eyes. With every movement of the eyes, images of stationary objects sweep across the retinae. Despite this, however, the world appears stable. To date this stability or constancy has been studied primarily under conditions in which the head is held stationary and only the eyes are free to move. The stimulus situation we examine is an extension of this traditional one; namely perceptual stability when both the head and the eyes are free to move. </p> <p><a href="index.htm"><span style='text-decoration:none;text-underline:none'><img border=0 width=86 height=63 id="_x0000_i1026" src="Desktop/Macintosh%20HD:Users:lillakas:Desktop:Home_Button.JPG" alt="ome Button.JPG (5374 bytes)"></span></a></p> </div> </body> </html>