In the introduction, the author gives the list of the different available GC-O methods, and especially the third group that corresponds to the intensity methods that can be divided in 3 sub categories:

1- posterior intensity method,

2- time-intensity methods

3- the cross-modality matchinf finger span technique.

But in which of these 3 sub categories can be classified the "perceived intensity method" examined in the paper ? Time intensity method ?

Article Evaluation of two gas chromatography–olfactometry methods: T...