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(A note: starch gelation is often referred to as starch gelatinization. Technically, gelatinization is the process that occurs to gelatin (a protein) in hot liquids. Gelation is the proper term for the process in carbohydrate gels.)
The gelation range varies among starches for different types of plants. Most, however, begin the range of 120–140 °F (50–60 °C). [Differences exist among plants starches because different plants have a different ratio of amylose (straight-chained starch) to amylopectin (branched starch).] An upshot of this is that many grains or other starchy adjuncts can simply be stirred into the mash. The temperatures in the saccharrification range or below are sufficient to gelate the starch and render it accessible to amylase enzymes. For example, unmalted wheat has a gelatinization temperature range between 58-65°C (136-147°C) and can, therefore, be gelatinized during a beta amalyse/maltose rest (fine milling will help efficiency) <ref>[https://onlinelibrary.wiley.com/doi/full/10.1002/jib.107 Common wheat (Triticum aestivum L.) and its use as a brewing cereal – a review. Andrea Faltermaier, Deborah Waters, Thomas Becker, Elke Arendt, Martina Gastl. 2014.]</ref>. Some starches, however, have gelation temperatures starting above mash temperatures. Likewise, some starchy adjuncts have traditionally been boiled to obtain a better extract or to speed up hydration. For example, Mike Karnowski reported increasing the gravity of a raw wheat and pilsner malt wort from 1.030 SG to 1.036 SG by doing a cereal mash with the raw wheat and 1/4 of the recipe's pilsner malt. Karnowski reported the best efficiency of 1.044 SG with wheat flour at a 154°F saccharrification mash rest, indicating that a fine crush might be the most efficient way to convert raw wheat starches to sugar <ref>[Mike Karnowski. "Homebrew Beyond the Basics: All-Grain Brewing & Other Next Steps". Sterling Epicure; Revised, & Expanded edition (October 2, 2018). Pg 156.]</ref>. Briggs et al (2004) recommends pre-soaking raw wheat in 185°F water instead of boiling so as to avoid frothing, and then mashing in with room temperature water to avoid clumping <ref>Dennis E. Briggs, Chris A. Boulton, Peter A. Brookes and Roger Stevens. "Brewing Science and Practice". 2004.</ref>.
Corn grits and rice are two common adjuncts in American Pilseners (and American Bocks). These ingredients are boiled, along with a small amount of barley malt, in what is called a cereal mash. Also, in traditional Belgian lambic brewing, raw wheat is sometimes boiled — again, with a bit of malted barley — before stirring it into the mash. (A step mash is used in other occasions.) This is not called a cereal mash, but the process is the same. For brevity, I'll simply call the process "a cereal mash" rather than "a cereal mash or the process that's exactly the same as a cereal mash but not labeled as such because a standard beer grain or non-cereal adjunct is involved."