Recent research used tools, such as diffusion tensor imaging and NODDI, to examine putative white matter abnormalities and its relationship to social cognition. Upon concluding the study, the results showed that schizophrenics had lower fractional anisotropy (FA) within the inferior fronto-occipital fasciculus and splenium of the corpus callosum compared to healthy controls. In contrast, the SPD group had FA in these same regions that was intermediate to and significantly different from both groups. Group differences in FA could be attributed specifically to alterations in extracellular fiber coherence.

Neurological factors of SPD

Recent research suggests that neurocognitive deficits in patients with schizophrenia may increase the risk of developing cognitive biases. In light of this,  Grimes et al. (2024) investigated neurocognition and found that there was no moderating effect of schizotypal traits on externalizing bias, but it was significantly associated with subsyndromal positive symptoms. Furthermore, only the externalizing bias was associated with subsyndromal positive symptomatology, which might be explained by a restricted range and reduced variance in performance as a result of using a university student sample. 

Neurocognitive Factors of SPD

Metacognitive deficits is a potentially informative construct that may underpin the foundation of multiple mental health disorders. In the case of SPD, recent research has shown that individuals with relatively high levels of schizotypy also exhibit heightened levels of metacognitive deficits. Moreover, evidence suggests that these metacognitive disturbances in SPD  are closely linked to function

Metacognitive Factors of SPD

Metacognitive deficits have been proposed as a transdiagnostic construct that may underpin the phenomenology of multiple mental health disorders. One study reviewed evidence supporting this including findings of heightened levels of metacognitive deficits in persons with relatively high levels of schizotypy and significant schizotypal personality disorder traits as well as evidence that these metacognitive disturbances in both schizotypy and schizotypal personal disorder are closely linked to function. 


Cognitive deficits of SPD

Within the realm of psychology, etiology, or rather the study of necessary and sufficient causes, is important in understanding the intricacies of certain disorders

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A personality disorder characterized by: 
- Various oddities of thought, perception, speech, and behavior that are not severe enough to warrant a diagnosis of schizophrenia

Symptoms may include:
- Perceptual distortions
- Magical thinking
- Social isolation 
- Vague speech without incoherence
- Inadequate rapport with others due to aloofness or lack of feeling
- Symptoms not because of schizophrenia, other psychotic disorder, or ASD

Schizotypal Personality Disorder

Psychotherapy has been found to be beneficial treatments:
- Cognitive-behavioral Therapy
- Supportive Therapy
- Family Therapy

Medications have not been found, but patients may find antidepressants useful.

Schizotypal Personality Disorder Treatments

Szeszko, P. R., Kowalchyk, M., Chu, K.-W., Aladin, S., Dolgopolskaia, E.-S., Ng, S., Hollander, S., Perez-Rodriguez, M. M., McClure, M. M., Kahn, R. S., Chan, C. C., Haznedar, M. M., Goldstein, K. E., Fleysher, L., & Hazlett, E. A. (2025). Investigation of brain white matter and social cognition in schizophrenia and schizotypal personality disorder using neurite orientation dispersion and density imaging. Molecular Psychiatry, 30(10), 4792–4800. https://doi-org.ccl.idm.oclc.org/10.1038/s41380-025-03074-1


Neuroscience of Schizotypal Personality Disorder

Etiology of Schizotypal Personality Disorder

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References

While there are many factors attributing to the onset of SPD, one that is particularly referenced is the idea that Schizotypal Personality Disorder should be classified under the schizophrenia Spectrum of disorders. Originally, the concept of SPD emerged from observations of personality characteristics common in relatives of schizophrenic patients. Building off of this idea, researchers have called attention to modifiable ELF for SPD and inform readers of possible future interventions to reduce developmental risks, such as parent‐training or environmental enrichment programs


Epidemiology of SPD

From various research, psychologists have found that potential treatment options are:
1) Psychopharmacological treatment options for schizophrenia spectrum disorders include antipsychotic drugs such as Thorazine, Chlorpromazine, Clozaril, Risperdal, and Abilify.
2) Psychological treatment options for schizophrenia spectrum disorders include CBT, the goal of which is to improve the interpretations and understandings of symptoms (and experiences) which will reduce associated distress.
3) Family interventions for schizophrenia spectrum disorders include psychoeducation, problem￾solving skills, cognitive-behavioral therapy (CBT), social skills training, and inpatient/partial hospitalizations.


Treatment for SPD 

Criterion A: 2+ in the following areas:
1) Identity: Confused boundaries between self and others; distorted self-concept; emotional expression often not congruent with context 
2) Self-direction: Unrealistic or incoherent goals; no clear set of internal standards.
3) Empathy: Difficulty understanding the impact of own behaviors on others; frequent misinterpretations of others' motivations and behaviors.
4) Intimacy: Marked impairments in developing close relationships associated with mistrust and anxiety.

Criterion B: 4+ of the following traits
1) Cognitive and perceptual dysregulation: Odd thought processes; vague, circumstantial, metaphorical, overelaborate, or stereotyped thought or speech; odd sensations in various sensory modalities.
2) Unusual beliefs and experiences: Thought about reality that are viewed as bizarre or idiosyncratic; unusual experiences of reality.
3) Eccentricity: Odd behavior or appearance; saying unusual or inappropriate things.
Restricted affectivity: Little reaction to emotionally arousing situations; constricted emotional experience and expression; indifference or coldness.
4) Withdrawal: Preference for being alone; reticence in social situations; avoidance of social contacts and activity; lack of initiation of social contact.
5) Suspiciousness: Expectations of, and heightened sensitivity to, signs of interpersonal ill-intent or harm; doubts about loyalty and fidelity of others; feelings of persecution.

Criteria for Schizotypal Personality Disorder

Based on the available research, schizotypal personality disorder occurs concurrently with other psychological disorders 

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