Quick summary: Early adversity and insecure attachment can leave people more likely to read ambiguous social cues as rejection or threat, so suspiciousness is often a learned protective response rather than a simple personality flaw. This matters for mental health practice because treating paranoia as a continuum, shaped partly by past safety and trust, helps clinicians respond with assessment of interpersonal expectations instead of dismissing concern as irrational. Later relationships and greater awareness of automatic interpretations can shift those expectations towards safer readings of others, which supports recovery and more effective psychological care.

Human beings rarely interpret social interactions in a completely neutral manner. A change in another person’s tone of voice, an unfamiliar facial expression, perceived social exclusion or an unexpected lack of communication can generate remarkably different interpretations. While one person may perceive ambiguity, another may perceive rejection, hostility or potential threat.

A growing body of psychological research suggests that these differences cannot be understood exclusively in terms of present circumstances. Early experiences may contribute to relatively enduring expectations regarding interpersonal safety, trust and threat. In particular, adverse childhood experiences⁠, insecure attachment and exposure to unpredictable environments may influence how individuals subsequently interpret the intentions of others.

This does not mean that childhood adversity inevitably produces psychological difficulties. Rather, early adversity may represent one factor within a complex developmental pathway involving cognition, attachment, emotional regulation and later environmental experiences.

How early experiences shape expectations of threat

Childhood represents an important developmental period during which individuals acquire fundamental assumptions about themselves, other people and their environment.

Repeated experiences of responsive and predictable caregiving may contribute to expectations that interpersonal relationships are relatively safe and that distress can be regulated with the support of others. Conversely, environments characterised by abuse, neglect, instability or conflict may provide very different information about the reliability and safety of the social world.

Research examining adverse childhood experiences and threat-learning mechanisms⁠ suggests that early adversity may influence processes involved in detecting, anticipating and learning about potential threats.

Within an unpredictable environment, increased sensitivity to threat may initially serve an adaptive function. Closely monitoring changes in another person’s emotional state, behaviour or tone of voice may help an individual anticipate conflict or danger.

However, psychological strategies developed within threatening environments do not necessarily disappear when circumstances change. Heightened sensitivity to interpersonal threat may continue beyond the context in which it initially developed.

From hypervigilance to paranoid thinking

Hypervigilance involves increased sensitivity to potential danger. Within social interactions, this can include heightened attention to facial expressions, changes in behaviour and other cues that could indicate hostility or rejection.

Difficulties may emerge when ambiguous information is repeatedly interpreted in a threatening direction. A neutral facial expression may be perceived as hostile, a delayed response as deliberate rejection, or the behaviour of others as personally significant despite limited information about their intentions.

These processes may be particularly relevant to understanding paranoid thinking.

Importantly, paranoia is increasingly understood as existing along a continuum rather than occurring exclusively within psychotic disorders. Measures such as the Paranoid Thoughts Scale⁠ have been developed to examine paranoid thinking across different levels of severity, including ideas of reference and persecutory ideation.

At lower levels, suspiciousness may involve concerns about criticism, rejection or the intentions of others. More pronounced forms may involve stronger beliefs that other individuals deliberately intend to cause harm.

Understanding this continuum is important because it moves the discussion beyond viewing suspiciousness simply as irrational behaviour. In some cases, heightened attention to threat may be better understood as a psychological response shaped partly by previous experiences.

Attachment, schemas and interpersonal trust

Attachment provides another framework through which these processes can be understood.

Early interpersonal experiences may contribute to expectations concerning whether other people are trustworthy and available, whether closeness is associated with security and whether vulnerability is likely to result in support or rejection.

A meta-analysis involving more than 10,000 participants⁠ identified associations between paranoid thinking and both attachment anxiety and attachment avoidance. Although these attachment patterns differ, both can involve difficulties surrounding interpersonal security and trust.

Cognitive schemas may provide an additional link.

Schemas are relatively enduring structures through which individuals organise information about themselves, other people and the world. If repeated experiences communicate that others are unpredictable, rejecting or potentially dangerous, expectations reflecting these experiences may become incorporated into broader beliefs about relationships.

Later social information can then be interpreted through these pre-existing expectations. A systematic review and meta-analysis⁠ identified meaningful associations between paranoia and negative beliefs about both the self and other people.

This may contribute to a self-reinforcing interpersonal cycle. Individuals who expect rejection or hostility may become particularly attentive to information that appears to confirm those expectations. Ambiguous social cues can consequently acquire threatening meaning, generating anxiety, withdrawal, reassurance-seeking or defensive behaviour.

Such responses may provide immediate psychological protection while reducing opportunities for corrective interpersonal experiences.

Can expectations of threat change?

Understanding the developmental context of suspiciousness does not mean assuming that every paranoid thought originates in childhood adversity. Nor does understanding why a belief developed establish that the perceived threat is objectively present.

Instead, a trauma-informed perspective⁠ encourages consideration of the contexts in which psychological responses may have developed.

For someone exposed to unpredictable or threatening environments, closely monitoring other people may once have been protective. The difficulty arises when the same strategy continues to operate across situations in which the original level of threat is no longer present.

Importantly, these patterns are not necessarily fixed. Later relationships can provide experiences that reinforce or challenge existing beliefs about safety and trust. Developing greater awareness of automatic interpretations may also create an opportunity to consider alternative explanations when social information is ambiguous.

The objective is not simply to encourage people to trust others indiscriminately. Trust develops through repeated experiences of safety, consistency and reliability.

Our interpretations of other people are not constructed entirely in the present. They are informed by previous relationships, experiences of safety and threat, attachment expectations and beliefs accumulated across development.

Diana-Irina Iordache holds an MSc in Forensic Psychology from Goldsmiths, University of London. She researches childhood trauma, attachment, personality and rule-breaking behaviour, and how these inform prevention, intervention and rehabilitation.