Glossary

Attention-Deficit/Hyperactivity Disorder (ADHD) is a common neurodevelopmental disorder marked by ongoing patterns of inattention, hyperactivity, and impulsivity that interfere with functioning or development. Typically diagnosed in childhood, ADHD often persists into adolescence and adulthood, affecting academic performance, workplace productivity, and social relationships. According to the DSM-5, ADHD is categorized into three types: inattentive, hyperactive-impulsive, and combined presentation, depending on the predominant symptoms observed over a period of six months or more.

Abnormal psychology is a branch of psychology that studies thoughts, emotions, and behaviors that deviate from societal norms and may cause distress, dysfunction, or harm. These patterns often interfere with daily life, affecting work, relationships, and well-being. The field explores the causes, classification, and treatment of psychological disorders, blending clinical practice with research to better understand mental health conditions and promote effective interventions.

Abusive behavior refers to repeated actions or words meant to control, harm, or dehumanize another person. It can take many forms, including physical, emotional, verbal, sexual, psychological, or financial abuse. Such behavior may occur in intimate relationships, families, workplaces, or institutions. Abusive patterns often undermine a person’s well-being, sense of safety, and self-worth, leading to long-term emotional, physical, or social harm if not addressed through intervention and support.

An Action Unit (AU) is a specific facial muscle movement identified through the Facial Action Coding System (FACS), a scientifically grounded framework developed by psychologists Paul Ekman and Wallace V. Friesen. Their work aimed to create an objective method for describing facial behavior based on observable muscle activity rather than subjective emotional interpretation. Within this system, Action Units serve as the smallest measurable components of facial expression.

Acute Stress Disorder (ASD) is a short-term psychological condition that arises in response to a traumatic or intensely stressful event. It typically occurs within three days to one month after the trauma and is marked by symptoms such as intrusive thoughts, emotional numbness, dissociation, heightened arousal, and avoidance behaviors. According to the DSM-5, individuals must exhibit at least nine symptoms across various domains, such as distressing memories, flashbacks, depersonalization, or hypervigilance, to meet the diagnostic criteria. If left unaddressed, ASD may develop into Post-Traumatic Stress Disorder (PTSD). Psychological interventions like Cognitive Behavioral Therapy (CBT) have shown effectiveness in reducing symptoms and preventing long-term distress.

The integration of Emotion AI in the assessment of ASD is a growing area of interest in psychology and mental health technology. Emotion AI tools can analyze subtle changes in facial expressions, tone of voice, and text patterns to detect early signs of acute stress. For instance, facial tension, microexpressions of fear, or flat affect may signal emotional suppression, while voice tremors or breathing changes may reflect hyperarousal or anxiety. Additionally, AI-driven journal analysis can detect trauma-related language and emotional dysregulation, offering real-time insights for both users and therapists. These tools are especially valuable in digital mental health platforms and early intervention systems where immediate human help may not be available.

However, ethical concerns must be addressed. Individuals with ASD are often emotionally vulnerable, and their interactions with emotionally responsive AI systems require strict guidelines around consent, emotional safety, and data privacy. Used ethically and sensitively, Emotion AI has the potential to support trauma-informed care by enhancing emotional awareness, supporting early detection, and complementing traditional therapeutic pathways.

Aesthetics is the philosophical study of beauty and taste. It is closely related to the philosophy of art, which is concerned with the nature of art and the concepts in terms of which individual works of art are interpreted and evaluated. In products and interfaces, aesthetics influences how users react at first glance, how much they trust the design, how easy it feels to use, and whether they want to keep engaging with it.

Affective computing is a field of computer science that focuses on helping machines understand human emotions. It enables systems to recognize, interpret, and respond to emotional signals such as facial expressions, voice tone, language, and behavior.

Agitation is an emotional state marked by high energy and negative feelings. It involves strong inner restlessness, physical tension, and a constant sense of discomfort or urgency. Agitation is not a basic emotion like fear or anger. Instead, it develops from a mix of unresolved emotions such as anxiety, frustration, fear, or feeling helpless.   

Agreeableness is a personality trait that reflects how cooperative, kind, empathetic, and emotionally considerate a person is during social interactions. It describes how strongly individuals value harmony, trust, compassion, and supportive communication. 

Anger is a basic human emotion that appears when someone feels hurt, threatened, or treated unfairly. It can range from mild annoyance to strong frustration or rage. Anger often shows up physically—like a tight jaw, a louder voice, faster heartbeat, or tense body movements. It pushes people to react, defend themselves, or fix a situation they believe is wrong.

Annoyance is a low- to moderate-intensity emotional state that arises in response to minor irritations, disruptions, or unmet expectations. It is often short-lived, but if the triggering stimulus persists or accumulates over time, it can escalate into stronger emotions such as frustration or anger. It refers to situations, behaviors, sounds, or interactions that repeatedly disrupt attention, expectations, or personal comfort. Unlike intense emotions such as anger or rage, annoyance is typically lower in intensity but can build over time if the source persists.

Attention span refers to the length of time an individual can maintain focused mental engagement on a task, stimulus, or activity without becoming distracted. It is a core component of cognitive functioning and varies significantly based on factors such as age, personal interest, emotional state, mental health, and environmental conditions. Attention span is not fixed; it fluctuates depending on context, motivation, and emotional relevance.

Autism Spectrum Disorder (ASD) refers to a complex neurodevelopmental condition characterized by differences in social communication, behavior, and sensory processing. Rather than being a singular condition, it exists on a spectrum, meaning individuals experience it in varied ways, from highly verbal and independent to non-verbal with high support needs. ASD is not a flaw or illness, it’s a different way of experiencing the world, often marked by both challenges and unique strengths.