Books
- Jerome Kagan – Galen’s Prophecy (1994); The Long Shadow of Temperament (with Snidman, 2004); The Temperamental Thread (2010). The primary source on high reactivity, from the researcher who defined it.
- Elaine Aron – The Highly Sensitive Person (1996); The Highly Sensitive Child (2002); The Highly Sensitive Parent (2020). The popular framework for sensory processing sensitivity.
- Susan Cain – Quiet: The Power of Introverts (2012) and Quiet Power (for teens). Accessible, well-sourced, and especially good on the “rubber band” and restorative niches.
- W. Thomas Boyce – The Orchid and the Dandelion (2019). The differential-susceptibility view.
Programs
- Cool Little Kids (Ronald Rapee and colleagues) – a six-session parent-education program with the strongest randomized-trial support for preventing later anxiety in inhibited preschoolers.
- Turtle Program (Andrea Chronis-Tuscano, Kenneth Rubin, and colleagues) – a parent-and-child intervention for behaviorally inhibited young children.
Organizations
- Anxiety & Depression Association of America (ADAA) – clinician directories and plain-language resources.
- American Academy of Child & Adolescent Psychiatry (AACAP) – “Facts for Families” and clinical guidance.
- Quiet Revolution (quietrev.com) – Susan Cain’s organization for introverts.
- HSP resources (hsperson.com) – Elaine Aron’s site, home of the self-report HSP Scale.
Assessment scales
These are research and clinical instruments, not self-diagnosis quizzes. Listed for completeness:
| Scale | Measures | By |
|---|---|---|
| HSPS | Sensory processing sensitivity | Aron & Aron, 1997 |
| BIQ | Behavioral inhibition (children) | Behavioral Inhibition Questionnaire |
| CBQ / ATQ | Temperament (children / adults) | Rothbart |
| BIS/BAS | Inhibition & activation systems | Carver & White |
A word on self-tests
Online “Are you an HSP?” quizzes can be a useful mirror, but they are not diagnoses, and a high score doesn’t equal a disorder. If a result worries you, bring it to a clinician rather than to a search engine.
If you need support now
In the U.S., the 988 Suicide & Crisis Lifeline is available 24/7 by call or text at 988. For finding ongoing care, the ADAA directory is a good starting point.