The language around neurodivergent relationships has developed quickly over the past decade — partly through autistic and ADHD communities naming their own experiences, partly through research catching up, partly through therapists and writers translating clinical concepts into everyday terms. If you've been reading in this space, you've encountered a cluster of terms that get used frequently but aren't always clearly defined.
This post explains the most commonly used ones — what they mean, where they come from, and why they matter in the context of adult relationships.
Parallel play is the practice of being together without active engagement — two people in the same space, doing their own separate things, deriving comfort and connection from shared presence rather than shared activity. The term comes from developmental psychology, where it describes how young children play alongside but not yet with each other.
In neurodiverse relationships, parallel play is often a primary love language. For many autistic and ADHD adults, being in the same room while each person is absorbed in their own thing is genuinely connecting — it doesn't feel like distance, it feels like comfortable closeness.
Problems arise when neurotypical partners interpret parallel play as withdrawal or disengagement. If "spending time together" means active engagement for one partner and shared presence for the other, neither person feels their needs met while both are trying. Naming the difference explicitly — and agreeing that parallel time counts as together time — tends to reduce this friction significantly.
Masking is the effortful process of suppressing or modifying natural behaviors, responses, and ways of being in order to appear more neurotypical in social contexts. It's most extensively documented in autistic adults but is also common in ADHD. Masking involves managing eye contact, suppressing stimming, monitoring tone and expression, and performing a social version of yourself that takes significant ongoing effort to maintain.
Many neurodivergent adults mask heavily in public and partially unmask at home — which can look, to a partner, like a personality change between contexts. A partner who sees the exhausted, unmasked version after social events and compares it to the apparently effortless public version sometimes wonders which one is the person they're with. Both are. The masked version costs more to produce. Understanding this changes how partners interpret the post-event shutdown and why home needs to be a low-demand space.
Info dumping is sharing extensively about a topic — with detail, depth, and length — without the social calibration that would otherwise trim it for a general audience. It happens most often around special interests but can also occur when an autistic or ADHD person is processing something significant or has been holding information they finally have space to share.
Info dumping is an act of trust and connection, not a performance or a lecture. Being on the receiving end requires more capacity than ordinary conversation. The friction tends to resolve when both partners have explicit agreements about what kind of listening is available — genuine interest, present but not tracking everything, or a time-limited window — rather than leaving it to the receiving partner to manage alone without saying anything.
Demand avoidance — most formally associated with Pathological Demand Avoidance (PDA), a profile seen in some autistic people — is a nervous system response to perceived demands or expectations. It's not willfulness or defiance. It's an anxiety-driven resistance to things that register as demands, including things the person genuinely wants to do.
Demand avoidance can make ordinary relationship maintenance feel fraught. Being needed, having implicit expectations, the sense of obligation that comes with relationship roles — all of these can activate avoidance. Partners often experience this as the person refusing to engage, withdrawing when things get close, or resisting even positive invitations. Understanding demand avoidance as a nervous system response changes the approach from "why won't you engage with me" to "how do we structure this so it doesn't register as a demand."
Stimming (self-stimulatory behavior) refers to repetitive movements, sounds, or sensory inputs that serve a regulatory function — managing sensory overload, releasing excess emotional energy, providing focus, or simply feeling good. Rocking, hand-flapping, pacing, tapping, humming, fidgeting — these are forms of stimming. Stimming is not a symptom to be eliminated. It's a regulation tool.
Partners who didn't grow up around stimming sometimes find it alarming or distracting, particularly forms that are visible or audible. Understanding that stimming is regulation — that suppressing it increases distress rather than reducing it — changes the conversation from "can you stop doing that" to "can we talk about what that is and what it does for you." Partners who learn to read stimming as information about their partner's state often find it useful rather than disruptive.
RSD is an intense emotional response to perceived or anticipated rejection, criticism, or disapproval. It's strongly associated with ADHD and involves a level of emotional pain that is immediate, physical, and often disproportionate to the trigger. RSD can be activated by neutral tones, brief replies, a partner being quiet, or any number of ambiguous signals that the nervous system reads as rejection.
RSD produces significant relational friction because partners who don't have it find it hard to understand why ordinary communication produces such intense responses. Walking on eggshells, editing what they say, managing the emotional aftermath of interactions that felt neutral to them — all are common experiences for partners of people with RSD. When both partners understand RSD by name, they can communicate around it rather than inside it.
Autistic burnout is a state of profound physical, emotional, and cognitive exhaustion resulting from sustained demands on an autistic nervous system — particularly the demands of masking, social performance, and navigating environments not designed for autistic processing. It's characterized by loss of previously held skills, increased sensory sensitivity, and exhaustion that doesn't respond to ordinary rest.
Autistic burnout often looks like withdrawal, personality change, or loss of capacity in a partner who was previously managing. Partners who don't know about burnout often interpret it as depression, as withdrawal from the relationship, or as something they caused. Understanding it as a nervous system state that requires reduced demands and genuine recovery — not increased pressure to engage — changes what the relationship needs to provide during these periods.
Introduced by researcher Damian Milton, the double empathy problem names the fact that difficulty in neurotypical-autistic interaction is bidirectional: both parties struggle to understand and empathize with each other's communication and perspective. Historically, only the autistic person's difficulty has been identified as a deficit. Neurotypical people have equal difficulty reading autistic communication and attachment — they just haven't been labeled for it.
This reframe matters enormously in neurodiverse couples. The problem isn't that one person is failing to communicate or connect adequately. Both people are struggling to read each other across a genuine difference in communication style. The work isn't to fix one person — it's to build a shared language. That's a fundamentally different and more equitable starting point for couples therapy.
A special interest is a topic or domain that an autistic person engages with at a depth and intensity that goes beyond ordinary interest. Special interests provide regulation, identity, and joy. They're not phases or fixations — they're a central part of autistic experience and often a primary source of the aliveness that makes autistic people who they are.
Being welcomed in sharing a special interest is one of the ways autistic people experience intimacy. Being shut down or dismissed in sharing it carries the history of being told the most authentic part of you is too much. Partners who learn to engage with special interests — even without matching the depth of interest — often find it one of the most direct routes to genuine connection with their autistic partner.
AuDHD refers to being both autistic and having ADHD simultaneously. The two conditions co-occur at higher rates than chance would predict, and the combination produces experiences that are sometimes distinct from either alone. AuDHD can involve the rigidity-seeking of autism in tension with the novelty-seeking of ADHD, producing an internal push-pull that is distinctive and often confusing without the framework to understand it.
AuDHD partners often present inconsistently in ways that can be hard to predict. The need for routine (autistic) in conflict with the resistance to routine (ADHD). The deep loyalty and attachment (autistic) combined with the impulsive communication (ADHD). Partners who understand AuDHD as its own distinct experience — rather than trying to explain behavior through either condition alone — tend to navigate these contradictions more effectively.
Alexithymia is difficulty identifying, describing, and understanding one's own emotional states. It's common in autistic adults — research suggests it affects a significant proportion — and is connected to interoception differences. The emotions are present; the internal channel that would communicate "this is what I'm feeling" isn't transmitting clearly.
Partners who ask "how do you feel about this?" and get a blank response often interpret it as avoidance or not caring. For a partner with alexithymia, the question isn't being dodged — it genuinely doesn't have a ready answer. Approaches that start with physical sensations ("what do you notice in your body?") or offer options ("does it feel more like frustration or disappointment?") tend to work better than open-ended emotional questions.
A shutdown is a withdrawal response to overwhelm — going quiet, becoming unresponsive, losing the ability to speak or engage. A meltdown is an outward expression of overwhelm — intense emotional distress that may involve crying, shouting, or loss of control over emotional expression. Both are responses to a nervous system that has exceeded its capacity, not choices or manipulations.
Shutdown is consistently misread as stonewalling — the deliberate refusal to engage that relationship researchers identify as one of the most damaging conflict behaviors. It isn't. The person in shutdown is not choosing to withhold; they have genuinely lost access to words and response. Meltdowns are misread as adult tantrums or emotional abuse, depending on how they express. Both require the same response from a partner: reduce demands, create safety, wait. Trying to push through a shutdown or escalate alongside a meltdown makes both worse.
Emotional permanence (also called object constancy) refers to the ADHD pattern where people who aren't immediately present stop feeling emotionally vivid or real. Just as object permanence in infants is the understanding that objects continue to exist when out of sight, emotional object permanence is the ongoing felt sense that people continue to matter when they're not in front of you. In ADHD, this can be significantly impaired.
This is one of the most misunderstood ADHD relationship patterns. A partner who travels for work and receives no contact for three days doesn't necessarily feel forgotten to the person at home — but they feel forgotten. The ADHD person's feelings about them are genuine and present when they're together; the feelings simply don't generate the reaching-out behavior in absence the way they would for a neurotypical person. Understanding this separates "they don't reach out" from "they don't care."
In the early stages of a relationship, many ADHD adults hyperfocus on their new partner — deeply attentive, curious, remembering everything, intensely present. This isn't performance. It's the interest-activation system doing what it does. As the relationship matures and novelty fades, the hyperfocus naturally shifts.
Partners who experienced the hyperfocus phase often describe the shift as the relationship changing, their partner becoming distant, or feeling like they're being left. Understanding this as a neurological pattern — not a withdrawal of love — is one of the most important reframes in ADHD relationship work. The person who is no longer the object of hyperfocus hasn't lost their partner's love; they've lost their partner's novelty-driven attention, which is a different and more workable thing.
Spoon theory, developed by Christine Miserandino, uses spoons as a metaphor for finite daily energy. Each activity costs a certain number of spoons; when they're gone, they're gone. For neurodivergent people managing higher baseline energy costs — from masking, sensory processing, executive function effort — the daily spoon count may be lower than a neurotypical person's and deplete faster.
"I'm out of spoons" has become common shorthand in neurodivergent communities for having no remaining regulatory or social capacity. For partners, understanding spoon theory reframes "I can't" from refusal to genuine depletion. It also opens conversations about which relationship activities cost which partner how many spoons — and how to plan for the week so both people have enough left to show up for each other.
Body doubling is the practice of having another person present while completing tasks — not helping, just being there. The presence of another person provides an external activating structure that helps ADHD nervous systems initiate and sustain focus on tasks they'd otherwise avoid. The body double doesn't need to be engaged; they can be doing something entirely different.
Partners who understand body doubling often find it changes how they interpret their partner needing them nearby while working. It's not dependency or inability to be alone — it's a legitimate executive function support strategy. Couples who figure out compatible body-doubling arrangements (each person doing their own thing in shared space) often find it reduces the friction around productivity that can otherwise create tension in shared living.
Monotropism is a theory of autism developed by Dinah Murray and colleagues that describes autistic attention as flowing strongly into a single channel at a time — deep and focused rather than distributed and flexible. Monotropic attention produces the intensity of special interests and hyperfocus, and also the difficulty with switching, transitioning, and multitasking.
Monotropism explains why interrupting an autistic partner mid-task produces a stronger response than the interruption seems to warrant — breaking out of deep single-channel focus is genuinely costly. It also explains why transitions between activities, contexts, or topics require more time and preparation. Partners who build in transition warnings ("in about ten minutes I'd like to talk") rather than abrupt topic shifts tend to have significantly smoother interactions.
Sensory processing differences run in two directions — and are covered in depth in Sensory Differences in Shared Living. Briefly:. Sensory avoiding means having a low threshold for sensory input — things are too loud, too bright, too textured, too much. Sensory seeking means having a high threshold — needing more input to feel regulated, actively pursuing sensation, finding certain strong sensory experiences calming rather than overwhelming. Many neurodivergent adults have elements of both, often across different senses.
Sensory differences create some of the most practical day-to-day friction in shared living — the temperature of the room, the volume of the television, the texture of shared bedding, the lighting in the evening. When one partner is sensory avoiding and the other is sensory seeking, every shared environment is a negotiation. Naming sensory profiles explicitly — rather than framing preferences as pickiness or insensitivity — opens the conversation about how to create shared space that genuinely works for both people.
Having the language is the beginning. Understanding what it means in your specific relationship is the work.
I work with neurodiverse couples and neurodivergent adults navigating the patterns these terms describe. AANE-trained, EFT-informed, virtual across TX, NH, ME, and MT.
Related reading: Autism and Attachment · What Is Alexithymia? · Shutdown vs Meltdown · Emotional Object Permanence · The Double Empathy Problem · Sensory Differences in Shared Living · Info Dumping and Special Interests · ADHD and Relationships · What Is AuDHD?
