Biometric methods in the field of neuromarketing measure physiological responses to marketing stimuli. Biometrics identifies subconscious cognitive and emotional responses that traditional surveys cannot detect. This technology captures unconscious reactions, such as arousal, attention and engagement, providing a more accurate understanding of consumer decisions.

Biometrics monitors physical changes such as pupil dilation, heart rate and skin conductance.

The best results are achieved by combining eye-tracking methods with GSR to gain a comprehensive understanding of consumer behaviour, as individual metrics can reveal only aspects of cognitive function or emotion.

When measuring galvanic skin response (GSR), the data indicate the intensity of emotional arousal in the human brain. GSR measures subtle changes in skin conductivity caused by sweat gland activity, serving as the primary indicator of the intensity of emotional arousal.

Electrocardiographs are used to monitor heart rate (ECG) in order to analyse physiological responses, anxiety, relief and emotional exhaustion, and how adverts influence brain responses.

Eye-tracking: this records pupil size, indicating cognitive thought processes or emotional arousal. The direction of gaze and duration of fixation are measured to determine which elements of an advert or packaging attract the most attention.

To interpret facial expressions within specific emotional categories, the Facial Action Coding System (FACS) is used.

These methods are most effective when combined with other neuromarketing tools, such as EEG, as biometrics provide a more precise measure of the intensity of the experience, whilst neuroimaging helps to identify reactions. This multifaceted approach enables marketers to optimise campaigns for emotional impact and to predict real-world sales results more accurately than data reported by test surveys.

This is an exciting time, when technological advances can be applied across a range of sectors. It will be interesting to see how the new fields of neuromarketing and biometrics develop over the coming years.

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