Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Spatial summation in blindsight

P Stoerig1

  • 1Institut für Medizinische Psychologie, Ludwig-Maximilians-Universität, München, Germany.

Visual Neuroscience
|November 1, 1993
PubMed
Summary
This summary is machine-generated.

Blindsight patients show distinct spatial summation differences for white versus red light stimuli. This suggests separate neural pathways process color and intensity information in the visual system.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Change blindness and time to consciousness.

The European journal of neuroscience·2002
Same author

Low-level phenomenal vision despite unilateral destruction of primary visual cortex.

Consciousness and cognition·2002
Same author

Detection and discrimination of chromatic targets in hemianopic macaque monkeys and humans.

The European journal of neuroscience·2001
Same author

The neuroanatomy of phenomenal vision: a psychological perspective.

Annals of the New York Academy of Sciences·2001
Same author

Neural correlates of religious experience.

The European journal of neuroscience·2001
Same author

Sustained extrastriate cortical activation without visual awareness revealed by fMRI studies of hemianopic patients.

Vision research·2001
Same journal

Support for the efficient coding account of visual discomfort.

Visual neuroscience·2024
Same journal

Visual Field Asymmetries in Responses to ON and OFF Pathway Biasing Stimuli.

Visual neuroscience·2024
Same journal

Pattern reversal chromatic VEPs like onsets, are unaffected by attentional demand.

Visual neuroscience·2024
Same journal

The interaction between luminance polarity grouping and symmetry axes on the ERP responses to symmetry.

Visual neuroscience·2024
Same journal

Electroretinographic responses to periodic stimuli in primates and the relevance for visual perception and for clinical studies.

Visual neuroscience·2024
Same journal

Synaptotagmin-9 in mouse retina.

Visual neuroscience·2024
See all related articles

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Blindsight is a condition where individuals with visual cortex damage can respond to visual stimuli without conscious perception.
  • Spatial summation describes how the visual system integrates stimuli over an area to detect a signal.

Purpose of the Study:

  • To investigate the spatial summation properties of visual field defects in patients with blindsight.
  • To compare the summation of white and red light stimuli in normal and defective visual fields.

Main Methods:

  • Measured increment thresholds for white and red targets of varying sizes (9-110 min arc) in five blindsight patients.
  • Conducted measurements under light-adapted conditions favoring the color-opponent system.
  • Analyzed spatial summation curves in both normal and defective hemifields.

Related Experiment Videos

Main Results:

  • Linear spatial summation was observed for red stimuli in both normal and defective visual fields.
  • White stimuli showed nonlinear summation in the normal hemifield.
  • A significant eccentricity-dependent notch in summation curves was found for white stimuli in the defective hemifield.

Conclusions:

  • The neurons mediating visual sensitivity exhibit different spatial summation properties for wavelength (color) versus intensity (brightness) information.
  • These findings suggest distinct neural processing streams for color and intensity information, even in the context of blindsight.