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FIG 2. Four measured ratios (m1, m2, c1, c2) are shown for all 12 patients. TIA-affected regions are compared with corresponding contralateral brain regions (m1) and to thalamic controls (m2) not affected by TIA (solid symbols). The resultant ratios are consistently below unity and are around 0.82. However, when regions of brain not affected by the TIA are compared (c1, c2), no interhemisperic difference is noted and the ratios approach unity (open symbols).
