EEG and behavioral data confirm the iconicity principle and cognitive load theory in AAC, but major threats to internal validity call these results into question¹

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The commentary authors do not have any interests to declare and are solely responsible for the content and writing of this Commentary.

Notes

¹ The research team did not report degrees of freedom or provide specific p values for any statistical measure.

² It was unclear if Huang and Lin were referring to intrinsic load (i.e., inherent difficulty associated with the task), extraneous load (i.e., demands placed on the child secondary to presentation mode or stimuli selected), or germane load (i.e., working memory resources for the construction and automation of schemas in knowledge acquisition).