Computer-implemented methods are provided. A method includes determining, by a processor, a cognitive load of a plurality of words included in a rapid serial visual presentation by using at least one metric. The cognitive load is determined on any of a word level and a word sequence level. The method further includes calculating, by the processor, a variable presentation rate for the plurality of words based on the cognitive load. The method also includes controlling, by the processor, a displaying of the plurality of words on a display device in accordance with the calculated variable presentation rate based on a threshold by temporarily reducing the variable presentation rate responsive to the cognitive load being above the threshold.