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BIAL Foundation
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DE:"Visual hallucinations"
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Type Title Begin End
DocumentVisual hallucinations in schizophrenia: Confusion between imagination and perception2008

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2000
Location: Arquivo PCA - Pastas 1 a 13/2000
Title:
2000 Grants
Start date: 2001-01 - 2014-02
Dimension/support:
13 caixas de arquivo

Reference code: PT/FB/BL-2000-020
Location: Arquivo PCA - Pasta 5/2000
Title:
020 - Neuropsychological bases of reality monitoring deficits in schizophrenic patients with hallucinations
Duration: 2000-12 - 2002-07
Researcher(s):
Gildas Brébion, Anthony David
Institution(s): Institute of Psychiatry, King’s College, London (UK)
Contents: Contents:
Application form
Correspondence
Financial report and expenditure documents
Progress reports
Final report
4 Articles
Language: eng
Author:
Brébion, G.
Secondary author(s):
David, A. S.
Number of reproductions:
1
Keywords:
Psychophysiology / Biopsychological problems / Mental health / Psychotic disorders / Altered states of consciousness / Hallucinations / Cognitive processes

Reference code: PT/FB/BL-2000-020.09
Location: Arquivo PCA - Pasta 5/2000
Title:
Visual hallucinations in schizophrenia: Confusion between imagination and perception
Publication year: 2008
URL:
http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=2008-05020-011
Contents: http://apps.webofknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=74&SID=Z1T1li1SW9lnlKPlMpq&page=1&doc=2
Abstract/Results: ABSTRACT:
OBJECTIVE:
An association between hallucinations and reality-monitoring deficit has been repeatedly observed in patients with schizophrenia. Most data concern auditory/verbal hallucinations. The aim of this study was to investigate the association between visual hallucinations and a specific type of reality-monitoring deficit, namely confusion between imagined and perceived pictures.
METHOD:
Forty-one patients with schizophrenia and 43 healthy control participants completed a reality-monitoring task. Thirty-two items were presented either as written words or as pictures. After the presentation phase, participants had to recognize the target words and pictures among distractors, and then remember their mode of presentation.
RESULTS:
All groups of participants recognized the pictures better than the words, except the patients with visual hallucinations, who presented the opposite pattern. The participants with visual hallucinations made more misattributions to pictures than did the others, and higher ratings of visual hallucinations were correlated with increased tendency to remember words as pictures. No association with auditory hallucinations was revealed.
CONCLUSIONS:
Our data suggest that visual hallucinations are associated with confusion between visual mental images and perception.
Accessibility: Document does not exist in file
Language:
eng
Author:
Brébion, G.
Secondary author(s):
Ohlsen, R., Pilowsky, L. S., David, A. S.
Document type:
Article
Number of reproductions:
1
Percentiles:
75.69|1.08
Reference:
Brébion, G., Ohlsen, R., Pilowsky, L. S., & David, A. S. (2008). Visual hallucinations in schizophrenia: Confusion between imagination and perception. Neuropsychology, 22(3), 383-389. https://doi.org/10.1037/0894-4105.22.3.383
2-year Impact Factor: 3.201|2008
Times cited: 54|2026-02-04
Indexed document: Yes
Quartile: Q1
Keywords: Visual hallucinations / Schizophrenia / Reality monitoring / Recognition
DocumentResting-state functional connectivity and cortical thickness characterization of a patient with Charles Bonnet syndrome2019

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: NDE
Location: Arquivo PCA - Pasta 1/Outros Apoios
Title:
Characterization of “Near-Death Experiences” through the comparison of experiencers and non-experiencers’ particularities: inter-individual differences in cognitive characteristics and susceptibility to false memories
Duration: 2016-03 - 2019-03
Researcher(s):
Steven Laureys, Charlotte Martial, Héléna Cassol
Institution(s): Coma Science Group, University of Liège (Belgium)
Contents: Application
Research Funding Agreement
Progress report
Final report
Articles
Language: eng
Author:
Laureys, S.
Number of reproductions:
3
Keywords:
Parapsychology and Psychophysiology / Near-death experience / Functional magnetic resonance imaging (fMRI)

Reference code: NDE-44
Location: Arquivo PCA - Pasta 1/Outros Apoios
Title:
Resting-state functional connectivity and cortical thickness characterization of a patient with Charles Bonnet syndrome
Publication year: 2019
URL:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6638931/
Abstract/Results: ABSTRACT:
Charles Bonnet syndrome (CBS) is a rare condition characterized by visual impairment associated with complex visual hallucinations in elderly people. Although studies suggested that visual hallucinations may be caused by brain damage in the visual system in CBS patients, alterations in specific brain regions in the occipital cortex have not been studied. Functional connectivity during resting-state functional magnetic resonance imaging (rs-fMRI; without hallucinations) in CBS patients, has never been explored. We aimed to investigate brain structural and functional changes in a patient with CBS, as compared with late blind (LB) and normally sighted subjects. We employed voxel-based morphometry and cortical thickness analyses to investigate alterations in grey matter characteristics, and rs-fMRI to study changes in functional brain connectivity. Decreased grey matter volume was observed in the middle occipital gyrus and in the cuneus in the CBS patient, and in the middle occipital gyrus and in the lingual gyrus within LB subjects, compared to their respective control groups. Reductions in cortical thickness in associative and multimodal cortices were observed in the CBS patient when comparing with LB subjects. The precuneus exhibited increased functional connectivity with the secondary visual cortex in the CBS patient compared to the controls. In contrast, LB patients showed decreased functional connectivity compared to sighted controls between the DMN and the temporo-occipital fusiform gyrus, a region known to support hallucinations. Our findings suggest a reorganization of the functional connectivity between regions involved in self-awareness and in visual and salience processing in CBS that may contribute to the appearance of visual hallucinations.
Accessibility: Document exists in file
Language:
eng
Author:
Martial, C.
Secondary author(s):
Larroque, S. K., Cavaliere, C., Wannez, S., Annen, J., Kupers, R., Laureys, S., Di Perri, C., Ginsberg, S. D.
Document type:
Article
Number of reproductions:
3
Percentiles:
21.76|0.28
Reference:
Martial, C., Larroque, S. K., Cavaliere, C., Wannez, S., Annen, J., Kupers, R., Laureys, S., Di Perri, C., & Ginsberg, S. D. (2019). Resting-state functional connectivity and cortical thickness characterization of a patient with Charles Bonnet syndrome. PLoS ONE, 14(7), e0219656. https://doi.org/10.1371/journal.pone.0219656
2-year Impact Factor: 2.740|2019
Times cited: 7|2026-02-11
Indexed document: Yes
Quartile: Q2
Keywords: Visual hallucinations / Charles Bonnet Syndrome / Cortex / fMRI / Vision

Resting-state functional connectivity and cortical thickness characterization of a patient with Charles Bonnet syndrome

Resting-state functional connectivity and cortical thickness characterization of a patient with Charles Bonnet syndrome
DocumentRapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields2024

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2018
Location: BF-GMS
Title:
2018 Grants
Start date: 2019-01

Reference code: PT/FB/BL-2018-252
Location: BF-GMS
Title:
252 - Spiritual states induced by ayahuasca, and the involvement of the reward system
Duration: 2019-10 - 2022-09
Researcher(s):
Miguel Castelo-Branco, Gisela Lima, Miguel Raimundo, Pedro Fonseca, Carla Cavaleiro, Lorena Petrella, Célia Cabral, Antero Abrunhosa
Institution(s): Institute for Nuclear Sciences Applied to Health - ICNAS, University of Coimbra (Portugal)
Contents: Contents:
Application form
Correspondence
Research Funding Agreement
Progress report
Final report
Articles
Language: eng
Author:
Castelo-Branco, M.
Secondary author(s):
Lima, G., Raimundo, M., Fonseca, P., Cavaleiro, C., Petrella, L., Cabral, C., Abrunhosa, A.
Number of reproductions:
3
Keywords:
Ayahuasca / Dopamine and reward / Spiritual experience / Hallucinations / Psychophysiology and Parapsychology

Reference code: PT/FB/BL-2018-252.10
Location: BF-GMS
Title:
Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields
Publication year: 2024
URL:
https://doi.org/10.1016/j.neuroimage.2024.120718
Abstract/Results: Abstract:
N, N-dimethyltryptamine (DMT) is a psychedelic tryptamine acting on 5-HT2A serotonin receptors, which is associated with intense visual hallucinatory phenomena and perceptual changes such as distortions in visual space. The neural underpinnings of these effects remain unknown. We hypothesised that changes in population receptive field (pRF) properties in the primary visual cortex (V1) might underlie visual perceptual experience. We tested this hypothesis using magnetic resonance imaging (MRI) in a within-subject design. We used a technique called pRF mapping, which measures neural population visual response properties and retinotopic maps in early visual areas. We show that in the presence of visual effects, as documented by the Hallucinogen
Rating Scale (HRS), the mean pRF sizes in V1 significantly increase in the peripheral visual field for active condition (inhaled DMT) compared to the control. Eye and head movement differences were absent across conditions. This evidence for short-term effects of DMT in pRF may explain perceptual distortions induced by psychedelics such as field blurring, tunnel vision (peripheral vision becoming blurred while central vision remains sharp) and the enlargement of nearby visual space, particularly at the visual locations surrounding the fovea. Our findings are also consistent with a mechanistic framework whereby gain control of ongoing and evoked activity in the visual cortex is controlled by activation of 5-HT2A receptors.
Accessibility: Document exists in file
Language:
eng
Author:
Pais, M. L.
Secondary author(s):
Teixeira, M., Soares, C., Lima, G., Rijo, P., Cabral, C., Castelo-Branco, M.
Document type:
Article
Number of reproductions:
3
Percentiles:
61.26|0.88
Reference:
Pais, M. L., Teixeira, M., Soares, C., Lima, G., Rijo, P., Cabral, C., & Castelo-Branco, M. (2024). Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields. NeuroImage, 297, 120718. https://doi.org/10.1016/j.neuroimage.2024.120718
2-year Impact Factor: 4.5|2024
Times cited: 5|2026-02-16
Indexed document: Yes
Quartile: Q1
Keywords: Serotonin / 5-HT2A receptors / Psychedelics / Visual hallucinations / Population responses / Visual cortex

Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields

Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields