Alexithymia Test (TAS-20 Guide)

The TAS-20 (20-item Toronto Alexithymia Scale) is a self-report questionnaire that measures alexithymia, the difficulty identifying and describing one's own emotions ^[1]. Totals run from 20 to 100, and 61 or above is the commonly used threshold for probable alexithymia.

What is alexithymia?

Alexithymia (from Greek: a- "lack", lexis "words", thymos "emotion") is a personality trait characterized by difficulty in identifying, describing, and distinguishing one's own emotions. The term was coined by Peter Sifneos in the 1970s and is now recognized as a transdiagnostic factor relevant to many mental health and medical conditions.

It is not a formal condition in the DSM-5-TR or ICD-11; it is a dimensional trait present to varying degrees in everyone. In a Finnish general-population study, TAS-20 scores were normally distributed, consistent with a personality dimension, and alexithymia was more common in men than women ^[3].

Alexithymia is distinct from not caring about emotions. People with the trait often experience emotions as bodily sensations but lack the cognitive capacity to process and verbalize what they are feeling.

What do alexithymia questions ask about?

Statements used to assess alexithymia, when endorsed (rated 4–5), typically involve themes such as:

• uncertainty about what emotion one is feeling when physically aroused
• difficulty finding words for internal states
• preferring to focus on concrete external events rather than inner experience
• being more aware of physical tension than the emotions behind it

These are illustrative examples of the dimensions measured; the actual TAS-20 items are copyrighted and administered under clinical supervision.

What does the TAS-20 measure?

The Toronto Alexithymia Scale (TAS-20) is the criterion-standard 20-item measure developed by Bagby, Parker, and Taylor. It was introduced in two companion validation papers published in 1994 ^{[1] [2]} and has since been translated into many languages.

The TAS-20 measures three theoretically distinct but interrelated dimensions of alexithymia, each captured by a dedicated subscale.

The DIF and DDF subscales have been consistently identified as the strongest contributors to clinically meaningful alexithymia, and both show moderate-to-strong associations with depression and anxiety symptom severity. The EOT subscale shows weaker associations with other emotional-regulation constructs and is the most frequently debated component in the psychometric literature.

How do you give the TAS-20?

The TAS-20 is a self-report questionnaire completed by the individual being assessed. Respondents rate 20 statements on a 5-point Likert scale (1 = strongly disagree; 5 = strongly agree), describing how they are in general. Because alexithymia is a trait-level construct, it can be repeated at intervals (for example at intake, review and discharge) to track change.

How do you score and interpret the TAS-20?

Five items are reverse-scored before summing. Scores on each subscale are summed to produce the total TAS-20 score (range 20–100); higher scores indicate greater alexithymia.

• 61 or above: the widely used threshold for probable alexithymia.
• 52–60: an intermediate or "possible alexithymia" range.
• 51 or below: generally below the threshold for alexithymia.

These thresholds are clinical conventions rather than formally validated cutoffs from a single normative study. If you have completed a clinical TAS-20 and received a score, use the guide above to interpret it alongside your clinician's assessment.

Psychometric properties

• Reliability. The TAS-20 demonstrated good internal consistency and test-retest reliability in its development study ^[1].
• Factor structure. The three-factor structure (DIF, DDF, EOT) was theoretically congruent with the alexithymia construct and was replicated with confirmatory factor analysis in both clinical and nonclinical samples ^[1].
• Validity. Convergent and discriminant validity were supported by correlations with the NEO Personality Inventory and with measures of psychological mindedness and need-for-cognition, and concurrent validity by positive correlations with observer ratings of alexithymia in behavioural medicine outpatients ^[2].

Limitations

• Not a diagnosis. Alexithymia is not a diagnosis in DSM-5-TR or ICD-11; a high score reflects a trait dimension rather than confirming a specific condition.
• Conventional cutoffs. The 52 and 61 thresholds are clinical conventions, not cutoffs from a single normative study.
• Self-report. Results depend on the respondent's own reporting and should be interpreted alongside clinical interview and other information.
• EOT subscale. Externally Oriented Thinking is the most debated component in the psychometric literature.

How common is alexithymia?

Alexithymia is not rare. A Finnish study using the TAS-20 in a general-population sample of 1,285 adults found a prevalence of 13%, with markedly higher rates in men (17%) than women (10%). Male gender, advanced age, lower educational level, and lower socioeconomic status were associated with alexithymia in that study ^[3].

Alexithymia is substantially more prevalent in clinical populations than in the general population. It appears frequently alongside:

• Depression and anxiety: moderate associations between TAS-20 total score and depression severity have been replicated across dozens of samples; the DIF and DDF subscales show the strongest links.
• Somatic symptom presentations: alexithymia is independently associated with higher somatic symptom burden, even after controlling for diagnosed medical conditions, depression, and anxiety.
• Autism spectrum conditions: in a meta-analysis of 15 studies, about 50% of autistic participants scored in the alexithymia range on the TAS, compared with about 5% of neurotypical comparison groups ^[4]. See autism and the AQ.
• Eating disorders: alexithymia is frequently observed in anorexia nervosa and bulimia nervosa, where difficulty identifying internal states may complicate emotional processing in treatment.
• Substance use disorders: elevated alexithymia has been reported in people with alcohol and other substance use disorders, potentially related to using substances to manage poorly labelled internal states.
• Post-traumatic stress: trauma exposure, particularly childhood trauma, is associated with higher alexithymia scores; the direction of this relationship continues to be studied.

Because alexithymia is a transdiagnostic trait rather than a disorder, it is best understood as a dimension that may complicate the recognition and treatment of other conditions rather than as a diagnosis in its own right.

Alexithymia vs autism vs emotional blunting

These three phenomena are sometimes confused because each involves some form of altered emotional experience, but they are distinct in etiology, phenomenology, and clinical implications.

Alexithymia

Difficulty processing emotions cognitively; may experience bodily sensations without identifying them as emotions. The trait can occur at any intelligence level and is not inherently tied to social-communication differences. A clinician assessing for alexithymia alone would find no diagnostic category in either the DSM-5-TR or ICD-11.

Autism spectrum conditions

Often co-occurs with alexithymia: about 50% of autistic participants in a 2019 meta-analysis scored in the alexithymia range ^[4]. Social-communication differences are separate from emotion-processing difficulties.

Researchers have suggested that emotional processing difficulties once seen as a core feature of autism may instead reflect co-occurring alexithymia ^[4]. The two constructs can be measured and should be considered independently.

Emotional blunting

Reduced emotional intensity, rather than difficulty labelling emotions. Emotional blunting is most commonly encountered as a side-effect of antidepressants or antipsychotic medications.

It differs from alexithymia in that the emotional response itself is attenuated, not merely difficult to identify or describe. A person with emotional blunting may know they "should" feel something but simply not feel it; a person with alexithymia may feel something but be unable to name or articulate it.

Can alexithymia change?

Alexithymia exists on a spectrum and the research literature suggests it is not fixed. In a randomized controlled trial in 285 adults, both mindfulness-based and partner-based socio-emotional practice reduced TAS-20 scores ^[5].

Approaches that research has examined include:

• Mindfulness-based and dyadic practice: in that trial, 10 weeks of app-based mindfulness or partner-based (dyadic) socio-emotional practice, with weekly coaching, reduced TAS-20 scores in a non-clinical adult sample; with dyadic practice, gains in interoceptive awareness helped explain the change ^[5].
• Emotion-focused psychotherapy: therapies that explicitly train clients to name and differentiate emotions (such as emotion-focused therapy or AEDP) target the DIF/DDF dimensions most directly.
• Body-oriented approaches: interventions emphasizing interoceptive awareness (noticing and labelling internal physical signals as emotions) address the physiological dimension that often underlies alexithymia.
• Psychoeducation: learning an emotion vocabulary, keeping a daily mood log, and practising labelling emotions in low-stakes situations are commonly recommended first steps that can be built into routine care.

Clinicians integrating measurement-based care often track TAS-20 or similar measures over time to gauge whether emotional awareness is shifting in response to treatment. Change is generally gradual; improvements in alexithymia typically lag behind symptom-level changes.

Tracking emotional awareness over time

Because alexithymia is a trait-level construct, single-point measurement provides only a snapshot. Tracking scores across multiple time-points (for example, at intake, at three-month review, and at discharge) gives both the clinician and the client a more informative picture of whether emotional awareness is increasing.

When used within a measurement-based care programme, the TAS-20 complements symptom-level tools (such as depression or anxiety screeners) by capturing a process variable: the capacity to recognize and describe the internal states that underlie symptoms. Deterioration on TAS-20 subscales (particularly DIF) may signal that a client is becoming more emotionally avoidant, prompting a clinical conversation before symptom scores worsen.