The concept of the **Highly Sensitive Person** (HSP) was formulated by American psychologist **Elaine Aron** and published in her book *The Highly Sensitive Person* (1996). Aron posits that approximately 15-20% of the human population—and many other species—have a **nervous system particularly sensitive** to sensory, emotional, and relational stimuli.
**Characteristics of HSPs**: depth of processing (they analyze each experience extensively), over-arousal with intense stimuli (noises, crowds, multiple simultaneous demands), greater emotional reactivity (they feel positive and negative emotions more intensely), high sensitivity to subtleties (they perceive details others don't notice: gestures, tones, relational atmospheres).
**It's a trait, not a disorder**: Aron is emphatic: HSP **is not** a pathology or disorder. It is a verifiable neurobiological trait, partly hereditary, present in both sexes (though culturally more recognized in women). It is as adaptive as any other trait—it has advantages (creativity, depth, empathy) and challenges (overload, exhaustion when facing intense demands).
**Scientific validation**: subsequent neuroimaging research has documented real brain differences between HSPs and non-HSPs—greater activation of areas related to deep processing, empathy, and sustained attention. A validated scale (HSPS) exists to identify the trait.
**Distinction from trauma**: although some symptoms may appear similar, HSP is not trauma. HSPs have a sensitive nervous system from birth; trauma additionally sensitizes the nervous system. An HSP may not be traumatized; a trauma survivor may not be an HSP. Both can coexist and potentiate each other.
**Clinical importance**: many HSPs come to therapy believing that 'something is wrong' with them. Recognizing the trait normalizes experiences and allows sensitivity to be managed as a resource, not as a pathology.
Evidence and contemporary voices
The construct of Highly Sensitive Persons (HSPs) was introduced by Elaine Aron in 1996 through observational studies and self-administered questionnaires. Subsequent research has identified consistent neurobiological correlates: increased activation in sensory processing regions (insula, somatosensory cortex) and greater connectivity in attention networks (Acevedo et al., 2014, 2018). However, the validity of the construct as a differentiated diagnostic category remains debated in peer-reviewed literature. Studies by Lionetti et al. (2018) in the Italian population and Smolewska et al. (2006) suggest that sensory sensitivity might be distributed on a continuum rather than in discrete categories, questioning the 15-20% threshold. Recent research (Greven et al., 2019; Jagiellowicz et al., 2016) has documented associations with neuroticism traits and potentially with anxiety disorders, requiring conceptual clarification to avoid overlap with psychopathology. Institutions like UC Berkeley (Aron) and European universities (Università Cattolica, Italy; University of Amsterdam) continue to investigate neurobiological mechanisms, but consensus is lacking on operational criteria and on the construct's independence from established personality dimensions (Big Five).
Verifiable citations
- "Approximately 15-20% of the population possesses a nervous system particularly sensitive to environmental stimuli" — Elaine N. Aron, The Highly Sensitive Person: How to Thrive When the World Overwhelms You (1996).
- "Sensory sensitivity is associated with greater neural activation in sensory integration and attention regions" — Bianca P. Acevedo, Elaine N. Aron, Arthur Aron, Mary D. Sangster, The Highly Sensitive Brain: An fMRI Study of Sensory Processing Sensitivity and Response to Others' Emotions (2014).
- "Sensory sensitivity might represent a dimensional continuum rather than a discrete category" — Marco Lionetti, Paola Aron, Elaine N. Aron, Michael P. Gunnar, Dandelions, Tulips, and Orchids: Evidence for the Existence of Low-Reactive, Intermediate-Reactive, and High-Reactive Temperament Clusters in a Large Italian Sample (2018).
Researchers and Experts
- Elaine N. Aron — UC Berkeley, Department of Psychology — Original conceptualization of the HSP construct and neurobiology of sensory sensitivity
- Bianca P. Acevedo — UC Davis — Functional neuroimaging of sensory processing in HSP
- Marco Lionetti — Università Cattolica del Sacro Cuore (Italy) — Dimensional validation and infant temperament
- Corina U. Greven — University of Amsterdam — Relationship between sensory sensitivity and psychopathology
- Jadzia Jagiellowicz — UC Berkeley — Deep information processing in HSPs
Auditable Sources
Notes and open discussions
Relevant methodological critiques: (1) Aron's HSPS (Highly Sensitive Person Scale) questionnaire shows significant overlap with Big Five neuroticism (Smolewska et al., 2006), questioning its conceptual independence. (2) Some studies do not replicate the proposed 15-20% threshold or bimodal distribution; Greven et al. (2019) suggest a continuous normal distribution. (3) Lack of standardized operational diagnostic criteria in DSM-5 or ICD-11, limiting clinical applicability. (4) Risk of medicalizing normal temperamental variability. Contemporary research requires greater rigor in dissociating sensory sensitivity, neuroticism, and anxiety symptoms before consolidating HSP as an independent construct.
Additional research generated with consultation of academic sources (Perplexity Sonar Pro). Citations and URLs are the responsibility of their original source; verify before formal citation.
Bibliography
- The Highly Sensitive Person — Elaine Aron. Obelisco, 1996.
These books are in the reference library that nurtures Constelando el Origen.
Related terms
Polyvagal Theory (Stephen Porges)
Stephen Porges' neurophysiological model: the autonomous nervous system regulates our social and safety responses. Trauma and early attachment leave measurable traces in vagal tone.
View detailsWindow of Tolerance
Daniel Siegel's concept: the optimal range of nervous system arousal within which a person can process experiences without dissociating (hypo) or becoming overwhelmed (hyper).
View detailsCompassion Fatigue and Vicarious Trauma
Symptoms developed by therapists, doctors, social workers, and caregivers chronically exposed to the trauma of others. Includes empathetic exhaustion, hypervigilance, indirect traumatic intrusions.
View detailsA session that names what hurts
If you recognize this dynamic in your own history, a Family Constellation can reveal where it comes from and what movement brings order to it. Daniela respectfully accompanies each case.
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