Remove the hand from the design. Reduce the green color in the upper-left area of the background, making the background whiter while keeping the existing leaves and flowers. Maintain the vivid, vibrant color style of the original artwork. Make the Psi (Ψ) symbol thinner and more delicate, remove the horizontal lines inside its vertical stroke, and integrate the symbol with the brain so they form a single unified design. The Psi symbol must be large enough to divide the brain according to its shape, and its color should smoothly adapt to the dominant colors of the specific brain region it crosses. Apply only these modifications and preserve the overall original aesthetic.