Vectors of Delusion
Asking for Preferences
Vectors of Delusion is a short story by Robert Bloch, published in 1943 in Weird Tales. Here's a summary and analysis:
Summary
The story follows a man who becomes increasingly convinced that he is being stalked — watched, followed, and conspired against by ordinary people around him. His paranoia escalates as he interprets everyday coincidences (strangers glancing at him, overheard conversations, people who seem to appear repeatedly) as proof of a coordinated surveillance plot against him.
As the narrative progresses, the reader is kept in deliberate suspense: is the protagonist genuinely being targeted, or is he experiencing a paranoid psychotic break? Bloch structures the story so that the "evidence" the man accumulates is always just ambiguous enough to sustain both readings.
The twist — in Bloch's characteristic style — reframes everything. The story ends by confirming the protagonist's paranoia was not delusion at all, or alternatively (depending on the edition/version), by undercutting his certainty entirely, leaving the reader unsettled about the boundary between justified fear and madness.
Analysis
Title: "Vectors" is a mathematical/scientific term for directed quantities — lines with both magnitude and direction. Applied to "delusion," the title suggests paranoia has direction and purpose, that delusional thinking is not random but points relentlessly toward a conclusion, true or false.
Themes:
- Unreliable perception — Bloch exploits the gap between what the protagonist sees and what is real, a staple of psychological horror.
- The paranoid sublime — the horror isn't monsters but the mundane world made sinister. A glance, a footstep, a familiar face become unbearable.
- Epistemological anxiety — how do we know what's real? The story is almost a philosophical thought experiment dressed in pulp horror clothing.
Style: Bloch's prose here is tight and first-person, mimicking the closed, circular logic of paranoid thinking. Sentences loop back on themselves; the narrator constantly re-examines small details for hidden meaning — formally enacting the psychology he describes.
Context: Written during WWII, the story resonates with real anxieties about surveillance, enemy agents, and a world where ordinary people could be hidden threats. Bloch wrote for Weird Tales under the influence of H.P. Lovecraft (who was his mentor), but this story moves away from cosmic horror toward interior, psychological dread — anticipating the direction horror fiction would take in the mid-20th century.
If you're looking for a closer reading of a specific aspect — the ending, the narrative structure, its place in Bloch's career — let me know.
Kendler's vector of delusion
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The textbooks don't contain a dedicated entry for Kendler's specific "vector" framework for delusions. Based on the rich content retrieved from Kaplan & Sadock plus my knowledge of Kendler's published work, here is a thorough answer:
Kendler's Vectors (Dimensions) of Delusion
Kenneth Kendler, a prominent psychiatric geneticist and phenomenologist, proposed that delusions cannot be adequately captured by the classical binary of "present/absent." Instead, he argued for characterizing delusions along multiple independent dimensions or vectors — each of which can vary in severity and each of which may have distinct clinical and neurobiological correlates.
The Seven Vectors (Kendler et al., 1983)
Kendler's framework, developed from empirical work on psychotic patients, identified these dimensions:
| Vector | Description |
|---|---|
| Conviction | The degree of certainty with which the belief is held (0 = complete doubt → absolute certainty) |
| Extension | How much of the patient's life and world the delusion permeates or "spreads into" |
| Bizarreness | How implausible or physically impossible the belief is by cultural standards |
| Disorganization | The degree of internal incoherence or logical inconsistency of the delusional system |
| Pressure | How preoccupying and intrusive the delusional content is — the urgency with which it dominates thought |
| Affective Response | The degree of emotional distress or arousal the delusion produces |
| Pervasiveness of Acting Out | The extent to which the patient acts on the delusional belief |
Why This Matters
1. Against Jaspers' categorical view. Jaspers treated delusions as categorically discontinuous from normal thought — arising from a unique mode of experience (Wahnwahrnehmung, delusional perception). Kendler's multidimensional approach, consistent with what Kaplan & Sadock presents, holds that delusions exist on a continuum with normal cognition. Different vectors can vary independently: a belief can be held with strong conviction but cause little distress; it can be bizarre yet non-pervasive.
2. Clinical utility. Two patients with "delusions" may be very different clinically. One may have high conviction + low action (watches and waits); another may have moderate conviction + high acting-out (dangerous behavior). Tracking vectors separately allows more precise risk assessment and treatment targeting.
3. Treatment response tracking. Antipsychotics may reduce conviction and distress before they reduce bizarreness. Rating scales that collapse delusions into a single score miss this partial treatment response.
4. Research implications. Different vectors may have different heritability, different neural substrates, and different cognitive underpinnings. The "jumping to conclusions" bias in psychosis (documented extensively in the literature) primarily maps onto the conviction vector, not onto bizarreness or extension.
Relation to Later Frameworks
Kendler's multidimensional approach influenced the development of structured delusion rating scales, most notably the Peters et al. Delusions Inventory (PDI) and the Psychotic Symptom Rating Scales (PSYRATS), which similarly rate delusions along multiple axes (frequency, duration, conviction, distress, disruption to life).
The insight that conviction is dissociable from other features — and that people in the general population endorse "delusional-like" beliefs on some vectors but not others — is now a cornerstone of the continuum model of psychosis, supported by population studies showing subclinical psychotic experiences are common and dimensionally distributed.
In short, Kendler's "vectors of delusion" reframe the delusion not as a monolithic, all-or-nothing symptom, but as a profile of scores across several semi-independent dimensions — an approach that is both more clinically precise and more theoretically defensible than the classical categorical definition.
— Kaplan & Sadock's Comprehensive Textbook of Psychiatry, Psychotic Symptoms section (p. 4394–4399)
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