Object localization

Gregory William Schwartz*, Devon Greer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter


Information about location is so ingrained in our understanding of visual processing that we sometimes take it for granted. From photoreceptor mosaics to evenly spaced retinal ganglion cell receptive fields to retinotopic maps in the brain, orderly representations of space are everywhere. This chapter asks us to consider the representation of visual space more closely, in particular its precision. How far apart do two points in space need to be before they can be recognized as distinct? What about judging the alignment between edges, the orientation of a line, or the distance between two lines? Are the limits of object localization in perception simply a result of the density of retinal neurons? If so, is photoreceptor density the limiting factor, or is the representation of space degraded in the retinal output by ganglion cells that integrate over hundreds or thousands of photoreceptors? These are some of the questions I will address. Hopefully, the reader will be as surprised and as fascinated by the answers as I was when I learned about this field.

Original languageEnglish (US)
Title of host publicationRetinal Computation
Number of pages22
ISBN (Print)9780128198964
StatePublished - Aug 17 2021


  • Acuity
  • Behavioral performance
  • Broad thorny
  • Bug detector
  • Fixational eye movements
  • Fovea
  • High-definition RGCs
  • Hyperacuity
  • Local edge detector
  • Location
  • Prey detection
  • Snellen acuity
  • Spatial resolution
  • Spatial sampling
  • Spot detector
  • Vernier acuity
  • Visual processing

ASJC Scopus subject areas

  • General Medicine
  • General Neuroscience


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