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There are two perspectives regarding the human brain’s ability to multitask: concurrent multitasking where multiple tasks are performed simultaneously, and sequential multitasking with switching between tasks. This study investigates the human brain’s ability to “multitask” with multiple demanding stimuli of approximately equal concentration, from an electrophysiological perspective different from that of stimuli which don’t require full attention or exhibit impulsive multitasking responses. This study investigates the P3 component which has been experimentally proven to be associated with mental workload through information processing and cognitive function in visual and auditory tasks, where in the multitasking domain the greater attention elicited, the larger P3 waves are produced. This experiment compares the amplitude of the P3 component of individual stimulus presentation to that of multitasking trials, taking note of the brain workload. This study investigates how the average wave amplitude in a multitasking ERP experiment will be compared to the grand average when performing the two tasks individually with respect to the P3 component. Twenty undergraduate students at Barrett, the Honors College at Arizona State University (10 males and 10 females, with a mean age of 18.75 years, SD = 1.517) right-handed, with normal or corrected visual acuity, English as first language, and no evidence of neurological compromise voluntarily participated in the study. One hundred percent of participants underwent sequential multitasking in the presence of two demanding stimuli in the electrophysiological data, behavioral data, and subjective reported data. In this study, these findings indicate that the presence of additional demanding stimuli causes the workload of the brain to decrease as attention deviates in a bottleneck process to the multiple requisitions for focus, indicated by a reduced P3 voltage amplitude with the multitasking stimuli when compared to the independent. This study illustrates the feasible replication of P3 cognitive workload results for demanding stimuli, not only impulsive-response experiments, to suggest the brain’s tendency to undergo sequential multitasking when faced with multiple demanding stimuli. In brief, this study demonstrates that when higher cognitive processing is required to interpret and respond to the stimuli, the human brain results to sequential multitasking (task switching, not concurrent multitasking) in the face of more challenging problems with each stimulus requiring a higher level of focus, workload, and attention.