In some embodiments, the present invention provides an exemplary inventive system that includes: an apparatus to record: individual's brain electrical activity, a physiological parameter of the individual, and iii) an environmental parameter； a computer processor configured to perform: obtaining a recording of the electrical signal data； projecting the obtained recording of electrical signal data onto a pre-determined ordering of a denoised optimal set wavelet packet atoms to obtain a set of projections； normalizing the particular set of projections of the individual using a pre-determined set of normalization factors to form a set of normalized projections； determining a personalized mental state of the individual by assigning a brain state； determining a relationship between: the physiological parameter, the environmental parameter, and the personalized mental state； generating an output, including: a visual indication, representative of the personalized mental state, and) a feedback output configured to affect the personalized mental state of the individual.
