Illusory stimuli can be used to identify retinal blind spots, discuss

Using the South University Online Library, find two peer-reviewed journal articles on the filling-in phenomenon associated with blind spots. In your synopsis, you will include:

A summary of each of the journal articles
The main points discussed in each of the journal articles and how they relate to the week’s course and text readings
Your thoughts and perspectives regarding the concepts covered in each of the journal articles
Support your responses with examples.
Cite any sources in APA format.


Title: Illusory stimuli can be used to identify retinal blind spots.
Authors: Crossland MD; University College London Institute of Ophthalmology, London, United Kingdom. [email protected]
Dakin SC
Bex PJ
Source: PloS one [PLoS One] 2007 Oct 24; Vol. 2 (10), pp. e1060. Date of Electronic Publication: 2007 Oct 24.
Publication Type: Journal Article; Research Support, Non-U.S. Gov’t
Language: English
Journal Info: Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: Electronic Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS ONE Subsets: MEDLINE
Imprint Name(s): Original Publication: San Francisco, CA : Public Library of Science
MeSH Terms: Illusions*
Visual Fields*
Visual Perception*
Visual Cortex/*anatomy & histology
Adult ; Aged ; Aged, 80 and over ; Humans ; Models, Biological ; Ophthalmoscopy/methods ; Optic Disk ; Photic Stimulation ; Software ; Vision, Ocular ; Visual Pathways
Abstract: Background: Identification of visual field loss in people with retinal disease is not straightforward as people with eye disease are frequently unaware of substantial deficits in their visual field, as a consequence of perceptual completion (“filling-in”) of affected areas.
Methodology: We attempted to induce a compelling visual illusion known as the induced twinkle after-effect (TwAE) in eight patients with retinal scotomas. Half of these patients experience filling-in of their scotomas such that they are unaware of the presence of their scotoma, and conventional campimetric techniques can not be used to identify their vision loss. The region of the TwAE was compared to microperimetry maps of the retinal lesion.
Principal Findings: Six of our eight participants experienced the TwAE. This effect occurred in three of the four people who filled-in their scotoma. The boundary of the TwAE showed good agreement with the boundary of lesion, as determined by microperimetry.
Conclusion: For the first time, we have determined vision loss by asking patients to report the presence of an illusory percept in blind areas, rather than the absence of a real stimulus. This illusory technique is quick, accurate and not subject to the effects of filling-in.
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Grant Information: United Kingdom Wellcome Trust
Entry Date(s): Date Created: 20071025 Date Completed: 20080715 Latest Revision: 20181113
Update Code: 20200716
PubMed Central ID: PMC2020442
PMID: 17957244
Persistent link to this record (Permalink):
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