The inner life as primary plot
In psychological realism, what happens inside a character is the main event. The external plot events are real and matter, but their function is to create the conditions under which interior events occur: the shift in understanding, the failed act of self-deception, the moment of partial recognition. Writing the interior as the primary plot means giving it the same structural attention that external plot receives: the interior should have its own rising pressure, its own turning points, its own moments of irreversibility. The reader who is following the external plot is following a secondary story; the reader who is following the character's evolving self-understanding is following the actual novel. Both should be present, but the hierarchy should be clear in the writer's own sense of where the real drama lives.
The gap between thinking and doing
The gap between what characters think and what they do is one of psychological realism's most productive resources. Characters who understand their situation perfectly but behave as if they do not. Characters who intend one thing and do another without fully registering the difference. Characters who know what they should do and do something else instead, with or without self-awareness about the divergence. This gap is where the form's dramatic irony lives: the reader sees what the character cannot or will not see about the relationship between their inner life and their behavior. Writing the gap effectively requires being specific about both sides: the specific content of what the character thinks, and the specific behavior that diverges from it, in a way that makes the divergence feel psychologically real rather than authoritally convenient.
Unreliable self-knowledge as narrative engine
The character who does not fully understand themselves, who tells themselves a story about who they are that the novel gradually reveals to be partial or distorted, is the engine of psychological realism. Writing this requires simultaneous inhabiting of two positions: the character's own perspective, which the prose mostly renders from inside, and a slightly wider angle of vision that allows the reader to see what the character cannot. The second position should not be obtrusively authorial: it lives in the gap between what the character says and what the prose shows, in the details the character notices and misses, in the reactions of other characters whose perspective the narrative occasionally allows. The reader who is ahead of the protagonist in understanding is in the ideal position for psychological realist suspense: they can see what is coming before the protagonist can face it.
Specificity over abstraction in interiority
The abstracted interior is the novel's equivalent of telling rather than showing: telling the reader that a character is anxious, conflicted, sad, or afraid is less powerful by an order of magnitude than rendering the specific texture of what that state feels like in this character in this moment. Anxiety is not one thing: it has a specific quality, a specific location in the body, specific thoughts it generates, specific behaviors it produces, and a specific relationship to the thing the character is anxious about. Writing interiority with genuine specificity means knowing all of this and rendering the precise version of it that this character would experience, not the generic version that could apply to any character in any anxious situation. The specific is always more powerful than the general in fiction, and nowhere more so than in the rendering of inner states.
Psychology shaped by social circumstance
Psychological realism's inner life does not exist in isolation from the social and material conditions that have shaped it. A character's specific psychology, their particular anxieties, their characteristic defenses, their specific capacity for or failure of intimacy, has been produced by a specific history in specific social and economic circumstances. Writing the relationship between psychology and social circumstance requires understanding the causal chains that produced your character's inner life: what in their specific history, their specific class position, their specific relational environment, has generated the psychological patterns the novel is exploring. The psychological realist novel that accounts for this relationship is more honest than the one that treats the inner life as a freestanding phenomenon, independent of the world that produced it.
The ending as revelation
Psychological realism's endings are most powerful when they reveal what the character's psychology has been protecting them from throughout the novel: the thing they have been avoiding understanding, the cost of the self-deception they have been sustaining, the shape of what they have actually been doing while believing they were doing something else. This revelation does not need to be dramatic or explicit: the best psychological realist endings are often quiet, and the revelation is available to the reader through the accumulated evidence of the novel without being stated. What the ending should not do is resolve the psychological problem too cleanly: genuine self-understanding comes at a cost, changes something, and is followed by the difficult work of living differently, not by a sense of closure that the psychology has simply been tidied up.