ethnography communication device customer experience thinkstrait user centered design marketing research customer research user research understanding customers surveys interviews focus groups facial muscles cross-talk electrode design emg emotions tactile stimuli visual stimuli eeg neurosciences event related desynchronization attention thalamus affective media the elderly facial expression awareness system user testing prototyping diary studies customer expectations customer needs consistency satisfaction delight latent needs customer service service profit chain touch points moment of truth customer satisfaction service design
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