The subject matter disclosed herein provides methods for assessing potential safety and security risks by measuring a test subject's implicit affinity for violence or extremism. A series of sorting tasks can be generated for a user of a computer associated with a machine. At least two digital representations of association categories can be provided. A sequence of two or more trials can be executed. Each trial can provide a randomly-selected digital representation of a stimulus that can provide at least two digital representations of association categories; receive a selection by the user in response to the stimulus; and record a time between providing the randomly-selected digital representation of the stimulus and receiving the selection by the user. A score can be calculated reflecting the strength of the user's implicit association between one pair of identity-related and violence- or extremism-related categories and a different pair. Related apparatus, systems, techniques, and articles are also described.
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