Which neurotechnology tool has been most successfully implemented in retail product development labs to measure consumers' unconscious emotional responses to products?

The intersection of neuroscience and retail is creating revolutionary shopping experiences. Companies are increasingly using brain-computer interfaces and neuroimaging to understand consumer behavior at unprecedented levels. This poll tests your knowledge of how cutting-edge neurotechnology is being applied in retail environments to enhance product development and customer engagement. How familiar are you with these scientific innovations reshaping the retail landscape?

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Functional Near-Infrared Spectroscopy (fNIRS) headsets
Invasive neural implants with consumer volunteers
Full-body MRI scanning during shopping simulations
Transcranial direct current stimulation (tDCS) to enhance purchase decisions