Test anxiety shapes theta band activity linked to elevated working memory load during the encoding phase

Test anxiety is a prevalent issue among students, recognized for its disruptive impact on working memory through the depletion of attentional control resources; however, its precise effect on the underlying processes of working memory remains insufficiently understood. This study investigated the impact of test anxiety on neural oscillatory patterns during a Sternberg working memory task with three levels of cognitive load (2, 4 and 8 letters), using EEG. Participants with high test anxiety (HTA) and low test anxiety (LTA) were compared. Results showed that under the 4-letter condition, HTA individuals exhibited reduced involvement of top-down attentional control compared to LTA individuals, characterized by decreased theta activity during the encoding phase. For LTA individuals, theta activity increased with cognitive load from 2 to 4 letters during the encoding phase but plateaued beyond 4 letters, while HTA individuals showed no significant theta modulation across loads. These findings highlighted the nuanced effect of test anxiety on working memory neural dynamics under varying cognitive loads. This study showed that test anxiety reduced theta band activity during the working memory encoding phase under medium load due to insufficient attentional control; and the cognitive load effect on theta band activity during the encoding phase was influenced by test anxiety level.