A method for assessing the effect of the environment on cognitive function, the method comprising: - receiving, at an assessment computer, geographic location of the portable touchscreen personal computing device; - correlating the geographic location with at least one environmental factor; - providing at least one cognitive assessment test to a portable touchscreen personal computing device, which, when executed by the portable touchscreen personal computing device enables self administration of the at least one cognitive assessment test by the individual by: ∘ generating cognitive assessment stimuli perceptible to the individual; ∘ receiving responses to the stimuli from the individual via touchscreen activations; ∘ measuring reaction times of the responses to the stimuli; and ∘ transmitting the received responses and measured reaction times to the assessment computer for storage in a database; - receiving first cognitive assessment performance data relating to the individual, said first cognitive assessment performance including the received responses and measured reaction times; - generating performance metrics including at least a first cognitive baseline for the individual based at least on the first cognitive assessment performance data and normed performance metrics relating to a statistically-meaningful plurality of individuals defined by a plurality of geographic locations, wherein the normed performance metrics relating to the statistically-meaningful plurality of individuals are dynamically generated by the assessment computer based on further cognitive assessment performance data collected from a plurality of portable touchscreen personal computing devices that enabled self-administration of the at least one cognitive assessment test by the plurality of individuals; and - comparing the first cognitive assessment performance data with performance data of the statistically-meaningful plurality of individuals based on the geographic locations, and, thus, the environment, by the assessment computer. - receiving, at an assessment computer, geographic location of the portable touchscreen personal computing device; - correlating the geographic location with at least one environmental factor; - providing at least one cognitive assessment test to a portable touchscreen personal computing device, which, when executed by the portable touchscreen personal computing device enables self administration of the at least one cognitive assessment test by the individual by: ∘ generating cognitive assessment stimuli perceptible to the individual; ∘ receiving responses to the stimuli from the individual via touchscreen activations; ∘ measuring reaction times of the responses to the stimuli; and ∘ transmitting the received responses and measured reaction times to the assessment computer for storage in a database; ∘ generating cognitive assessment stimuli perceptible to the individual; ∘ receiving responses to the stimuli from the individual via touchscreen activations; ∘ measuring reaction times of the responses to the stimuli; and ∘ transmitting the received responses and measured reaction times to the assessment computer for storage in a database; - receiving first cognitive assessment performance data relating to the individual, said first cognitive assessment performance including the received responses and measured reaction times; - generating performance metrics including at least a first cognitive baseline for the individual based at least on the first cognitive assessment performance data and normed performance metrics relating to a statistically-meaningful plurality of individuals defined by a plurality of geographic locations, wherein the normed performance metrics relating to the statistically-meaningful plurality of individuals are dynamically generated by the assessment computer based on further cognitive assessment performance data collected from a plurality of portable touchscreen personal computing devices that enabled self-administration of the at least one cognitive assessment test by the plurality of individuals; and - comparing the first cognitive assessment performance data with performance data of the statistically-meaningful plurality of individuals based on the geographic locations, and, thus, the environment, by the assessment computer.