Disturbances of agency and ownership in schizophrenia: An auditory verbal event related potentials study

A ‘sense of self’ is essentially the ability to distinguish between self-generated and external stimuli. It consists of at least two very basic senses: a sense of agency and a sense of ownership. Disturbances seem to provide a basic deficit in many psychiatric diseases. The aim of our study was to manipulate those qualities separately in 28 patients with schizophrenia (14 auditory hallucinators and 14 non-hallucinators) and 28 healthy controls (HC) and to investigate the effects on the topographies and the power of the event-related potential (ERP). We performed a 76-channel EEG while the participants performed the task as in our previous paper. We computed ERPs and difference maps for the conditions and compared the amount of agency and ownership between the HC and the patients. Furthermore, we compared the global field power and the topographies of these effects. Our data showed effects of agency and ownership in the healthy controls and the hallucinator group and to a lesser degree in the non-hallucinator group. We found a reduction of the N100 during the presence of agency, and a bilateral temporal negativity related to the presence of ownership. For the agency effects, we found significant differences between HC and the patients. Contrary to the expectations, our findings were more pronounced in non-hallucinators, suggesting a more profoundly disturbed sense of agency compared to hallucinators. A contemporary increase of global field power in both patient groups indicates a compensatory recruitment of other mechanisms not normally associated with the processing of agency and ownership.

Air cargo potentials between the U.S. and Paraguay /

At head of title: Inquiry Reference Service.

Multimedia assessment of pollution potentials of non-sulfur chemical pupling technology /

Mode of access: Internet.

Transportation in America's future: potentials for the next half century. Part 1: societal context. Final report.

Transportation Department, Washington, D.C.

Transportation in America's future: potentials for the next half century. Part 2: transportation forecasts. Final report.

Transportation Department, Washington, D.C.

An analysis of the potentials and prospects of increasing edible oil production in West Pakistan : research conducted in Jan. 1971 /

Mode of access: Internet.

Algorithms for sparse Gaussian elimination with partial pivoting /

Bibliography: p. 17.

Sparse matrix inversion,

Mode of access: Internet.

An error analysis of solutions to sparse linear programming problems,

"Supported in part by the Advanced Research Projects Agency ... contract no. US AF 30(602) 4144."

Potentials for vegetable processing: eastern Arkansas; a report

Bibliography: leaf at end.

Pagine sparse, raccolte da G. Castellano.

Mode of access: Internet.

Istoria delle cose auuenute in Toscana dall'anno 1300, al 1348. Et dell'origine della Parte Bianca [et] Nera, che di Pistoia si sparse per tutta Toscana [et] Lombardia ... / scritta per autore che ne' medesimi tempi visse ...

Edit16,

Notizie della santa casa della gran Madre di Dio Maria Vergine adorata in Loreto : già sparse in fogli sciolti /

Mode of access: Internet.

Radioactive waste-disposal potentials in selected geologic basins : a reconnaissance study /

"Prepared under Contract AT(04-3)-413 for the San Francisco Operations Office, U.S. Atomic Energy Commission."

Magnetic flowmeter output potentials : flowmeters /

"March 1, 1952."