SENSATION and PERCEPTION

                            PSYC 310

Fall 1999:  Lecture - Tuesday, 1 - 3; Laboratory sections - Thursday 1 - 3, Friday 1 - 3.
Instructor: John P. McLaughlin. Office - 213 Wolf; hours - T,Th 11-12; W 2-3; email:  johnmcl@udel.edu; telephone: 302-831-2752; McLaughlin's Syllabus
 
 

 Notes on attention

McLaughlin's  grades

 Northmore's grades

McLaughlin's Midterm study guide

McLaughlin's Final  study guide

 Reading for aesthetics lecture
 
 
 
 
 
 

How many straight lines, interrupted or uninterrupted, do we have here ?
 
 
 

Web Sites with perceptual demonstrations:

    Visual Phenomena:

York Univ site.
        This site has a lot of definitions and diagrams and some demonstrations.

  IllusionWorks site.
        This site has some very sophisticated demonstrations.

  A tutorial that includes interesting demonstrations, including size constancy and Benham's Top .These were provided by Dr. John Krantz at Hanover College.

 A large set of color demonstrations. These were provided by Dr. Hans Irtel at the University of Mannheim.

  Purdue University site, CogLab    This site has good on-line experiments such as Apparent Motion and Visual Search. They were created by Dr. Greg Francis.

 Another Purdue site, VisLab.  This has more on-line experiments for vision.

What parts are in front in these designs ? How long does that impression last ?
 

    Auditory Phenomena:

  McGill Univ. site.
 
 

Miscellany
    Some color/space interactions:

        Neon colors. Notice that the hues "spread" into the space surrounding the colored lines.

Here is a related phenomenon, called assimilation. How are they related ?  Hint: the red field is physically uniform.
 


 

     Another demonstration of neon colors. This comes from Hans Irtel's web site.

    Color contrast. The gray patches below are physically identical to each other.


Color and acuity - divisionist artists

COLOR ABNORMALITIES  -  Some disturbances of color vision are caused by problems at the retinal or cortical levels. Others can be caused by abnormalities in the lens, i.e., cataracts. Here is what the world looked like to Monet, who developed cataracts as he aged, and then had one removed.  Here is the Japanese bridge before and after he developed the cataracts.  The next picture contrasts his view of his garden using an eye with a cataract with the view using the eye from which the cataract was surgically removed.

    Visual System

         A sample of retinal anatomy

         An artist's (ahem) conception of overlapping receptive fields on the retina. Red, green and blue circles represent fields of ganglion cells that are wavelength selective. Black circles represent fields of cells that are not selective.

         The pattern of retinal-geniculate-cortical connections.

         Recent work on the separate analyses of color and motion in the visual pathways
 
 
 
 

Text and original graphics copyrighted by John P. McLaughlin, 1999, all rights reserved. Last updated, November 16, 1999.