1. A system, comprising: a presenter device operable to provide marketing stimuli; a data collection mechanism operable to obtain response data using a plurality of modalities, the plurality of modalities including electroencephalography (EEG) and electrooculography (EOG); a data cleanser mechanism operable to filter the response data; an intra-modality response synthesizer operable to enhance response data associated with each of the plurality of modalities; a cross-modality response synthesizer operable to combine response data associated with each of the plurality of modalities to validate response data in each of the plurality of modalities; a composite enhanced effectiveness estimator operable to generate a composite enhanced effectiveness measure of the marketing stimuli.