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 Concept Videos

Positive Symptoms Schizophrenia: Hallucinations and Delusions01:26

Positive Symptoms Schizophrenia: Hallucinations and Delusions

206
Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
Hallucinations
Hallucinations in...
206
Synesthesia01:27

Synesthesia

280
Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
280
Positive Symptoms of Schizophrenia: Hallucinations and Delusions01:30

Positive Symptoms of Schizophrenia: Hallucinations and Delusions

260
Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes...
260
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

1.3K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
1.3K
Gestalt Principles of Perception01:21

Gestalt Principles of Perception

749
Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
749
Visual Agnosia01:12

Visual Agnosia

564
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
564

You might also read

Related Articles

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

Sort by
Same author

Incidence of idiopathic intracranial hypertension (IIH) in adults and children: a 14-year population-based study.

Journal of neurology·2026
Same author

Novel heterozygous UCHL1 variant causing severe optic atrophy and vision loss.

Ophthalmic genetics·2026
Same author

Visual Acuity Alone Is Not Enough: The Need for Multimodal Biomarkers in Dominant Optic Atrophy-Response.

Clinical & experimental ophthalmology·2026
Same author

Understanding the phenotype of genetically associated electronegative ERG retinopathies: comparing the full-field ERG b:a ratio.

Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie·2025
Same author

Longitudinal Visual Biomarkers in Dominant Optic Atrophy: A Systematic Review and Meta-Analysis.

Clinical & experimental ophthalmology·2025
Same author

The Use Of Fundus Photography In The Emergency Room-A Review.

Current neurology and neuroscience reports·2025
Same journal

Preface.

Handbook of clinical neurology·2026
Same journal

Foreword.

Handbook of clinical neurology·2026
Same journal

Fundus autofluorescence imaging.

Handbook of clinical neurology·2026
Same journal

The electroretinogram as a means to study the physiology of the retina.

Handbook of clinical neurology·2026
Same journal

Adaptive optics scanning light ophthalmoscopy.

Handbook of clinical neurology·2026
Same journal

Modeling the human retina in a dish: Advances and future directions.

Handbook of clinical neurology·2026
See all related articles

Related Experiment Video

Updated: Nov 9, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
05:43

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Published on: May 23, 2019

5.7K

Illusions, hallucinations, and visual snow.

Clare L Fraser1, Christian J Lueck2

  • 1Department of Ophthalmology, Save Sight Institute, Faculty of Health and Medicine, University of Sydney, Sydney, Australia.

Handbook of Clinical Neurology
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

Illusions and hallucinations are common experiences linked to various neurological and ophthalmic conditions. Understanding their mechanisms, including topologic and hodologic pathways, enhances our knowledge of perception and brain function.

Keywords:
Alice in Wonderland syndromeCharles Bonnet syndromeEpilepsyHallucinationIllusionMigraineParkinson's diseasePeduncular hallucinosisSchizophreniaVisual snow

More Related Videos

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

656
MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

Published on: May 10, 2012

12.9K

Related Experiment Videos

Last Updated: Nov 9, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
05:43

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Published on: May 23, 2019

5.7K
Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

656
MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

Published on: May 10, 2012

12.9K

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Psychiatry

Background:

  • Illusions and hallucinations are frequently observed in clinical settings and daily life.
  • These phenomena offer insights into visual processing and perception.
  • Numerous conditions, ranging from ophthalmic causes to neurological disorders, are associated with these experiences.

Purpose of the Study:

  • To review the definitions and underlying mechanisms of illusions and hallucinations.
  • To explore specific conditions and syndromes associated with these visual disturbances.
  • To examine how pathological illusions and hallucinations arise in relation to their phenomenology and pathology.

Main Methods:

  • Literature review of definitions and mechanisms.
  • Discussion of associated conditions such as ophthalmic causes, migraine, epilepsy, Parkinson's disease, and schizophrenia.
  • Analysis of specific syndromes like Charles Bonnet syndrome, visual snow syndrome, Alice in Wonderland syndrome, and peduncular hallucinosis.

Main Results:

  • The study synthesizes current knowledge on the mechanisms of illusions and hallucinations.
  • It highlights the connection between these phenomena and various neurological and ophthalmic disorders.
  • Key concepts such as topologic vs. hodologic mechanisms and attentional networks are discussed.

Conclusions:

  • The scientific study of illusions and hallucinations significantly advances our understanding of vision processing and perception.
  • Distinguishing between different mechanisms and understanding attentional network involvement are crucial.
  • Investigating the phenomenology and pathology of associated conditions provides insights into the origins of these visual disturbances.