Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Parietal thalamocortical circuitry in global dream cessation
Until relatively recently, the overarching agreement in the clinical literature was that total cessation of dreaming is related to posterior parietal lesions. Two recent case reports (Bischof and Bassetti, 2004; Poza and Martí-Massó, 2006), in which patients with medial occipital lesions demonstrate...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Psychology
2020
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613204817903616 |
|---|---|
| access_status_str | Open Access |
| author | Hattingh, Coenraad J |
| author2 | Solms, Mark |
| author_browse | Hattingh, Coenraad J Solms, Mark |
| author_facet | Solms, Mark Hattingh, Coenraad J |
| author_sort | Hattingh, Coenraad J |
| collection | Thesis |
| description | Until relatively recently, the overarching agreement in the clinical literature was that total cessation of dreaming is related to posterior parietal lesions. Two recent case reports (Bischof and Bassetti, 2004; Poza and Martí-Massó, 2006), in which patients with medial occipital lesions demonstrated total cessation of dreaming, cast doubt on this clinic-anatomical correlation, and the neuropsychological theory of dreaming associated with it (Solms, 1997). In the current study, seven patients with medial occipital lesions (with posterior cerebral artery ischemic lesions) were recruited. Three patients had total dream cessation and four had intact dreaming (confirmed on REM awakening). Acute phase clinical neuroimaging was reviewed and the extent of the lesions in both groups was meticulously analysed by a neuroanatomist, who was blind to the dreaming status of each patient. The three patients with total cessation of dreaming all demonstrated posterior thalamic infarctions involving the pulvinar nucleus. All four of the patients with intact dreaming demonstrated medial temporo-occipital lesions, and none had thalamic lesions. Upon review of the source images of one of the two case studies with medial occipital damage and total dream cessation (Bischof and Bassetti, 2004), it was noted that the patient also demonstrated infarction of the pulvinar of the thalamus. The pulvinar of the thalamus has discrete thalamo-cortical connections to the parietal lobe, which it innervates. Disruption in the pulvinar of the thalamus can, therefore, reasonably be expected to result in parietal dysfunction. This study represents the largest case-report comparison in patients with REM-confirmed dream cessation with suitably circumscribed pathology. These findings cast doubt on claims of medial occipital mechanisms of dream cessation and suggest that posterior parietal circuitry remains involved. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/31287 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:26.116Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Department of Psychology |
| publisherStr | Department of Psychology |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/31287 Parietal thalamocortical circuitry in global dream cessation Hattingh, Coenraad J Solms, Mark non-dreamers cessation of dreaming dream loss neural correlates of dreaming medial temporo-occip Until relatively recently, the overarching agreement in the clinical literature was that total cessation of dreaming is related to posterior parietal lesions. Two recent case reports (Bischof and Bassetti, 2004; Poza and Martí-Massó, 2006), in which patients with medial occipital lesions demonstrated total cessation of dreaming, cast doubt on this clinic-anatomical correlation, and the neuropsychological theory of dreaming associated with it (Solms, 1997). In the current study, seven patients with medial occipital lesions (with posterior cerebral artery ischemic lesions) were recruited. Three patients had total dream cessation and four had intact dreaming (confirmed on REM awakening). Acute phase clinical neuroimaging was reviewed and the extent of the lesions in both groups was meticulously analysed by a neuroanatomist, who was blind to the dreaming status of each patient. The three patients with total cessation of dreaming all demonstrated posterior thalamic infarctions involving the pulvinar nucleus. All four of the patients with intact dreaming demonstrated medial temporo-occipital lesions, and none had thalamic lesions. Upon review of the source images of one of the two case studies with medial occipital damage and total dream cessation (Bischof and Bassetti, 2004), it was noted that the patient also demonstrated infarction of the pulvinar of the thalamus. The pulvinar of the thalamus has discrete thalamo-cortical connections to the parietal lobe, which it innervates. Disruption in the pulvinar of the thalamus can, therefore, reasonably be expected to result in parietal dysfunction. This study represents the largest case-report comparison in patients with REM-confirmed dream cessation with suitably circumscribed pathology. These findings cast doubt on claims of medial occipital mechanisms of dream cessation and suggest that posterior parietal circuitry remains involved. 2020-02-25T07:32:37Z 2020-02-25T07:32:37Z 2019 2020-02-25T06:20:52Z Master Thesis Masters MA http://hdl.handle.net/11427/31287 eng application/pdf Department of Psychology Faculty of Humanities |
| spellingShingle | non-dreamers cessation of dreaming dream loss neural correlates of dreaming medial temporo-occip Hattingh, Coenraad J Parietal thalamocortical circuitry in global dream cessation |
| thesis_degree_str | Master's |
| title | Parietal thalamocortical circuitry in global dream cessation |
| title_full | Parietal thalamocortical circuitry in global dream cessation |
| title_fullStr | Parietal thalamocortical circuitry in global dream cessation |
| title_full_unstemmed | Parietal thalamocortical circuitry in global dream cessation |
| title_short | Parietal thalamocortical circuitry in global dream cessation |
| title_sort | parietal thalamocortical circuitry in global dream cessation |
| topic | non-dreamers cessation of dreaming dream loss neural correlates of dreaming medial temporo-occip |
| url | http://hdl.handle.net/11427/31287 |
| work_keys_str_mv | AT hattinghcoenraadj parietalthalamocorticalcircuitryinglobaldreamcessation |