Depressive Symptoms, Depressive Disorder, Major
Conditions
Keywords
Sensory training, Depression, Olfaction, Emotion, Perception
Brief summary
During the past three decades, researchers have paid particular attention to the study of olfactory disorders in depression. Recent studies have shown that depression is characterized by a change in olfactory and emotional perception resulting in a decrease of the perception of positive stimuli (odors and facial expressions) and an increase in perception of negative stimuli (odors). Moreover, it has also been shown in healthy subjects that the presence of minor depressive symptoms leads to a decreasing of olfactory sensitivity. However, odor discrimination was not impaired in these subjects. This observation suggest the presence of a change in targeted olfactory perception in people with depressive symptoms without reporting major depression. In addition, studies in subjects with olfactory disorders (following respiratory tract infections or following Parkinson's disease) have shown an improvement in olfactory function after daily training with odors during 12 weeks. From all these observations, the hypothesis is that an olfactory training could improve the overall olfactory functioning and the emotional perception of the subjects presenting minor depressive symptoms and of the depressed patients.
Detailed description
Recent studies have shown that depression is characterized by a change in olfactory and emotional perception resulting in a decrease of the perception of positive stimuli (odors and facial expressions) and an increase in perception of negative stimuli (odors). Moreover, it has also been shown in healthy subjects that the presence of minor depressive symptoms leads to a decreasing of olfactory sensitivity. However, odor discrimination was not impaired in these subjects. This observation suggest the presence of a change in targeted olfactory perception in people with depressive symptoms without reporting major depression. In addition, studies in subjects with olfactory disorders (following respiratory tract infections or following Parkinson's disease) have shown an improvement in olfactory function after daily training with odors during 12 weeks. Therefore, the hypothesis is that an olfactory training could improve the overall olfactory functioning and the emotional perception of the subjects presenting minor depressive symptoms and of the depressed patients. The main objective is to study the effect of daily olfactory training on the emotional state and emotional perception of the subject. The effect of the training will be evaluated using three types of evaluations: (1) a clinical evaluation and the psychometric scales, (2) the investigation of the olfactory function and (3) the study of the emotional perception. The secondary objectives are: * The identification of olfactory parameters and emotional valences associated with minor depressive symptoms. * The study of the link between the subjective and objective emotional response on the one hand, and the link between olfactory function, emotional perception and emotional state on the other hand in depressed patients and in individuals with minor depressive symptoms.
Interventions
OTHERSensory training
12 weeks sensory training
Sponsors
University Hospital, Tours
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
healthy subjects: * Without psychiatric history * QIDS scale score less than or equal to 15 * Affiliation to a social security system * Able to give his written informed consent Inclusion Criteria depressed patients: * With a diagnosis of depressive episode characterized according to the DSM-5 criteria, confirmed by the Mini International Neuropsychiatric Interview (MINI) * No argument for bipolar disorder or schizophrenia, confirmed by the MINI * QIDS scale score greater than or equal to 16 * Follow-up in hospitalization and / or ambulatory consultation * Without comorbidities (alcoholism, eating disorders ...) * Affiliation to a social security system * Able to give his written informed consent
Exclusion criteria
healthy subjects and depressed patients: * Pathology or condition likely to modify their olfactory and / or taste perception * Allergies with one or more odors, food allergies and / or known anosmias and ageusia * Legal incapacity and / or circumstances rendering the person incapable of understanding the nature, objectives or consequences of the study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from Baseline Olfactory Perception at 3 months | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Score obtained with the Sniffin 'Stick test |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Emotional perception measured Sense'n Feel Method | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Score obtained with Sense'n Feel Method |
| Psychometric scale MINI : Psychiatric disorders exploration | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Mini International Neuropsychiatric Interview |
| Psychometric scale TAS-20 : alexithymia assessment | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Twenty-item toronto Alexithymia Scale (TAS-20) |
| Emotional perception measured with SMI RED-m Scientific device | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Observation of spontaneous pupillary dilatation with SMI RED-m Scientific device |
| Psychometric scale SHAPS : anhedonia assessment | Baseline (T0), a month and a half (T1.5), 3 months (T3) | The Snaith-Hamilton Pleasure Scale |
| Psychometric scale QIDS-SR16 : Depression assessment | Baseline (T0), a month and a half (T1.5), 3 months (T3) | Quick Inventory of Depressive Symptomatology |
| Psychometric scale STAI-Y : anxiety assessment | Baseline (T0), a month and a half (T1.5), 3 months (T3) | State Trait Anxiety Inventory |
Countries
France
Outcome results
None listed