Exposure Time
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Larger values of the Exposure Time result in a higher resolution and brighter images. The Exposure Time value equals the integration time per line of the scanner. Be aware that higher values lead to a non linear increase of scan time.
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Brightness
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Brightness indeed acts like a brightness adjustment. This option is only enabled in connection with the Dither mode.
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Contrast
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Adjusts the contrast of scanned grayscale images. This option is only enabled in connection with the Dither mode.
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High Light & Midtone & Shadow
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Act together like a brightness Filter. They increase the intensity in dark (shadow) or bright areas (High Light). Midtone varies the center point.
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Note: These features enhance or manipulate image data before they are transferred into the computer system. Therefore there is no way to revert this conversions, than to repeat the scan with different values. This may be faster than a software operation on images.