According to new research pursues to shed light on new aspects of the condition using olfactory tests. The results demonstrate that one of the characteristics of alexithymia is the altered physiological response to olfactory stimuli. New research conducted at SISSA in Trieste and published in the scientific journal Scientific Reports.

The tests also showed that there are differences in reactions between subjects characterized by affective alexithymia and those with cognitive alexithymia, which compromises the ability to identify, express and distinguish emotions. An individual could express emotions, they are able to name each and talk about them with relating to their feelings.

Among 10% of the healthy population, people processing the emotions by their experience; a physiological condition known as alexithymia. An alexithymic individual has difficulty, to a greater or lesser degree, in relating to the sensations ranging from joy to fear, from disgust to anger which make up our experience.

A study seeks to shed light on new aspects of the condition, using a hitherto completely untested approach. Specifically, given the close link which exists between the perception of smells and emotions, the scientists Cinzia Cecchetto, Raffaella Rumiati and Marilena Aiello used olfactory tests: "There is a partial overlap between the areas in our brains which deal with olfactory perception and those which process emotions.

A test such as this may, therefore, be particularly suitable for studying this specific psychological condition," explains Aiello, who coordinated the research. 62 individuals divided into three groups according to the severity of alexithymia (high, medium and low) underwent a series of olfactory tests to investigate their reaction to different types of stimulation.

The scientists found that alexithymic individuals differ from others in their reaction to smells. What specifically distinguishes them are their physiological parameters, such as their heart rate or the electrical conductivity of their skin, which resulted accelerated. The tests also showed that there are differences in reactions between subjects characterised by affective alexithymia, in which the sphere of sensations, imagination and creativity is restricted, and those with cognitive alexithymia, which compromises the ability to identify, express and distinguish emotions.

"The results obtained," explain Cinzia Cecchetto and Marilena Aiello, "show that one of the characteristics of alexithymia is the altered physiological response to olfactory stimuli." They also point to another interesting fact: "Contrary to what one might expect, this study shows how the physiological reactions of alexithymic individuals to emotions induced by smells are not less but rather more intense.

 It is as if these subjects find themselves in a situation of perpetual, extreme activation in relation to their emotions which appears to make them insensitive to changes in them, to differences, to the colour shades that enrich our daily lives. It is a counterintuitive yet particularly significant scientific observation."