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Insular gyri organization during responses to Valsalva maneuver (simplification of findings in Macey et al., 2012). Left: gyral activation relative to posterior-most gyrus (posterior long gyrus; PLG) on the left side, with anterior-most gryi showing great activation over posterior areas. Right: greater activation in right over left insular cortex in anterior and posterior gyri (mid short gyrus [MSG], PLG). Differences are significant (P < 0.05; Data from Macey et al., 2012).
