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SUMMARY:Hermann Lotze and Local Sign - Professor Michael Morgan\, Professo
 r of Visual Neuroscience at City University (Optometry) London  and a Max-
 Planck Senior Fellow at the Institute for Neurological Research in Cologne
DTSTART:20131129T163000Z
DTEND:20131129T180000Z
UID:TALK47188@talks.cam.ac.uk
CONTACT:Louise White
DESCRIPTION:Hermann Lotze (1817 – 1881) introduced the idea of retinal 
 ‘Local Sign’ to explain the sense of visual direction\, and proposed t
 hat the primary function of local sign is to direct overt and covert sacca
 dic eye movements.  Recent experiments have examined the relation between 
 saccades and perceived visual direction. I shall describe two sets of inte
 rlinked experiments. In the first\, saccades were made to virtual targets 
 defined by points of imaginary intersection. These saccades showed biases 
 similar in magnitude to perceptual effects in the Poggendorff figure.  Sec
 ond\, saccadic adaptation was induced by shifting the target during the ey
 e movement. With a target in a single visual direction\, rapid adaptation 
 took place so that the saccade landed near to the shifted target position\
 , This adaptation does not occur under conditions of partial reinforcement
  and does not transfer to other directions.  If training trials to several
  directions are interleaved\, there is some adaptation to intermediate pos
 itions. We sought to see whether this ‘global adaptation’ would have p
 erceptual consequences for perceived location of the saccadic adaptation i
 n a body-centered frame of reference.  \n\nBiography\nMichael Morgan (http
 ://www.staff.city.ac.uk/~morgan/) studied Experimental Psychology in Cambr
 idge (1964) and subsequently held Chairs in Psychology at Durham and Unive
 rsity College London\;\, and in Neuroscience at the Universiy of Edinburgh
 . He is currently Professor of Visual Neuroscience at City University (Opt
 ometry) and a Max-Planck Senior Fellow a the Institute for Neurological Re
 search in Cologne. He is the author of ‘Molyneux’s Question’ (1977) 
 and ‘The Space Between Our Ears’ (2005).\n\n\n
LOCATION:Ground Floor Lecture Theatre\, Department of Psychology
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