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The vast majority of fMRI studies of task-related brain activity utilizecommon levels of task demands and analyses that rely on the central tendenciesof the data. This approach does not take into account perceived difficulty norregional variations in brain activity between people. The results are findingsof brain-behavior relationships that weaken as sample sizes increase.Participants of the current study included twenty-six healthy young adultsevenly split between the sexes. The current work utilizes five parametricallymodulated levels of memory load centered around each individualâs predeterminedworking memory cognitive capacity. Principal components analyses (PCA)identified the group-level central tendency of the data. After removing thegroup effect from the data, PCA identified individual-level patterns of brainactivity across the five levels of task demands. Expression of the group effectsignificantly differed between the sexes across all load levels. Expression ofthe individual level patterns demonstrated a significant load by sexinteraction. Furthermore, expressions of the individual maps make betterpredictors of response time behavior than group-derived maps.

Subjective Difficulty in a Verbal Recognition-based Memory Task:  Exploring Brain-behaviour Relationships at the Individual Level in Healthy  Young Adults