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Bilateral visual field maps in a patient with only one hemisphere
Proceedings of the National Academy of Sciences of the United States of America, 08/06/09

Muckli L et al. – Findings for a case patient with only 1 cerebral hemisphere show surprising flexibility of the self-organizing developmental mechanisms responsible for map formation.

• Case-based review of the reorganization of retinotopic maps in the lateral geniculate nucleus (LGN) of thalamus and early visual areas (V1–V3)
• Case pt: pt born with only 1 cerebral hemisphere

• Before Wk 7 of embryonic gestation, termination of development of right cerebral hemisphere
• Despite complete loss of right hemisphere (di- and telencephalon) at birth, remaining hemisphere not only developed maps of contralateral (right) visual hemifield but also maps of ipsilateral (left) visual hemifield
• Retinal ganglion-cells changed predetermined crossing pattern in optic chiasm and grew to ipsilateral LGN
• In visual cortex, islands of ipsilateral visual field representations located along vertical meridian representations
• V1: smooth and continuous maps from contra- and ipsilateral hemifield overlap each other
• Ventral V2 and V3: ipsilateral quarter field representations invaded small distinct cortical patches

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