{"id":601,"date":"2023-06-19T13:46:27","date_gmt":"2023-06-19T12:46:27","guid":{"rendered":"https:\/\/medicine.st-andrews.ac.uk\/vision-in-childhood\/?page_id=601"},"modified":"2026-02-17T16:20:56","modified_gmt":"2026-02-17T16:20:56","slug":"history","status":"publish","type":"page","link":"https:\/\/medicine.st-andrews.ac.uk\/vision-in-childhood\/history\/","title":{"rendered":"History"},"content":{"rendered":"

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History<\/h1>\n

This page describes the early development and validation of CVI-SIM and provides historical context for later phases of the project.\u00a0 The way we have developed this preliminary simulation has been to listen in detail to the described visual experiences of adults with CVI who have diagnosed\u00a0dorsal stream<\/span>\u00a0dysfunction, including simultanagnostic vision.<\/p>\n

Initially we took videos inside a shop, to show the visual complexity of this exercise.<\/p>\n

We then asked volunteer adults with\u00a0dorsal stream<\/span>\u00a0dysfunction to give an auditory account of what they were able to see.<\/p>\n

We simulated their verbal description, and asked them to view these simulations and to let us know how realistic they were. The results were fascinating.<\/p>\n

We used this information to come up with our next simulation called the\u00a0Dorsal Stream<\/span>\u00a0Dysfunction CVI Experience<\/a>.<\/p>\n

This was viewed by several adults with validated marked\u00a0dorsal stream<\/span> dysfunction, who explained that when they compared the simulated version of this video with the version that was not simulated, the experience was very similar.<\/p>\n

[\/et_pb_text][et_pb_image src=”https:\/\/medicine.st-andrews.ac.uk\/vision-in-childhood\/wp-content\/uploads\/sites\/52\/2023\/06\/20230622-CVI-SIM-multiple-images.png” title_text=”20230622-CVI-SIM multiple images” force_fullwidth=”on” _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text admin_label=”Txt-Image Caption” _builder_version=”4.21.0″ _module_preset=”default” custom_margin=”-25px||||false|false” locked=”off” global_colors_info=”{}”]<\/p>\n

Some of our virtual reality classrooms with CVI simulations.<\/p>\n

[\/et_pb_text][et_pb_text _builder_version=”4.21.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

Encouraged by these results our team has gone on to develop the material you can see on the Phase 2 CVI-SIM page<\/a>, which has been validated using the same method.<\/p>\n

There is of course a philosophical conundrum in seeking validation of this nature. How can the person with simultanagnostic vision from an early age give an opinion of this nature? Doesn\u2019t their simultanagnosia preclude them from providing such an analysis?<\/p>\n

Recognising this conundrum, we have also sought the help from an adult with acquired simultanagnosia during teenage years who has the facility to compare her current vision with her memory of her previous \u2018normal\u2019 vision. This witness has affirmed that what we are now showing has great verisimilitude to her actual simultanagnostic visual experiences.<\/p>\n

Another way we have sought to ensure that what we are showing is as close as possible to what those who experience simultanagnosia every day, is to recognise that simultanagnosia is a dynamic, not a static phenomenon and that it becomes more marked when looking at greater complexity. This means that when viewing the most constrained visual emulations of simultagnostic vision those with the condition are least affected by it, because the peripheral masking we have created becomes evident to them owing to the overall diminished complexity of the simulated imagery.<\/p>\n

Validation Team<\/strong>\u00a0(each with a diagnosis of\u00a0dorsal stream<\/span> dysfunction and validated simultanagnostic difficulties)<\/p>\n