For research purposes, I need to determine how citizens perceive space through user experience; to do so, I need to identify different emotions using Heart Rate Variability Signals or ECG data. I need a way to do this.
I agree with Dr. Taylor. HRV and cardiac measures are the wrong place to look. There is a rather substantial literature that finds relations between discrete emotions and breathing parameters (the latter influencing respiratory sinus arrhythmia, i.e. high-frequency HRV). However, these relationships appear to be individual-specific: that is, they may be relatively stable for one person, but not at all characteristic for others. In any case, respiration, based on the extant literature, is where you need to be looking, and even there—with the great subtleties of emotional experience and expression being what they are—don’t expect too much even from respiratory measures: you surely have noticed that there are great differences in the degree to which people show their emotions, and these are also bound to affect respiratory variation.
See the work of Lisa Feldman Barrett. There is no such thing as an emotion response that is shared across people, since emotions are constructed individually by each person. There is no shared bodily sensation, no shared facial expression that is reliable across people, and no place where an emotion shows up in the brain.
Emotions are socially constructed and individually experienced. And emotions are essential aspects of cognition and meaning making. There is no separation between emotion and alleged logic either.
I agree with Drs. Taylor and Grossman. There is no way to identify emotions based on any single physiological variable. Emotions are complicated. However, there are significant relationships between configurations of variables and kinds of emotions. I wrote this review: Article The Alba Method and the Science of Emotions
When it comes to applying the science to use breathing and EEG to identify emotions, here are some relevant publications:
Article Multi-Target Positive Emotion Recognition From EEG Signals
Article Real-Time Movie-Induced Discrete Emotion Recognition from EEG Signals
Article Automated analysis of breathing waveforms using BreathMetric...
Article Data Augmentation for EEG-Based Emotion Recognition Using Ge...
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