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Related Experiment Videos

Auditory-visual synesthesia: sound-induced photisms

L Jacobs, A Karpik, D Bozian

    Archives of Neurology
    |April 1, 1981
    PubMed
    Summary
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    Sound-induced visual disturbances called photisms were experienced by patients with optic nerve or chiasm damage. This phenomenon, linked to a startle response, occurs in partially deafferented visual pathways.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Sensory Perception

    Background:

    • Lesions affecting the optic nerve or chiasm can cause significant visual impairment.
    • The complex relationship between auditory stimuli and visual perception is not fully understood.
    • Previous research has explored synesthesia, but sound-induced visual phenomena in specific neurological conditions require further investigation.

    Purpose of the Study:

    • To investigate and describe the phenomenon of photisms (visual disturbances) induced by sound in patients with optic nerve or chiasm lesions.
    • To explore the characteristics of these sound-induced visual events and their relationship to the underlying visual pathway damage.
    • To determine the potential role of the startle response and visual pathway deafferentation in this phenomenon.

    Main Methods:

    Related Experiment Videos

    • Case study of nine patients presenting with visual loss and experiencing photisms.
    • Detailed patient interviews to characterize the nature, intensity, and triggers of photisms.
    • Visual field testing (perimetry) to map visual defects.
    • Assessment of auditory localization and sound-induced startle responses.
    • Electrophysiological testing using visual evoked responses (VERs) to assess optic nerve and visual pathway function.

    Main Results:

    • Nine patients reported experiencing photisms triggered by various everyday sounds.
    • Photisms manifested as simple flashes or complex colorful hallucinations within their existing visual field defects.
    • The sounds were perceived by the ear ipsilateral to the eye experiencing the photism.
    • The phenomenon was associated with a startle reaction to sound.
    • Visual evoked responses indicated partial deafferentation in the affected visual pathways of seven patients.

    Conclusions:

    • Sound-induced photisms can occur in patients with partial deafferentation of the anterior visual pathway, particularly the optic nerve or chiasm.
    • The startle response to auditory stimuli appears to be a key factor in triggering these visual disturbances.
    • This phenomenon highlights an unusual interaction between auditory and visual processing in compromised neural pathways.