Spatial and temporal processing in a subject with cortical blindness following occipital surgery
Blindsight subjects are typically better at discriminating rapid, transient visual events than those with gradual on/off-sets. Surprisingly, the detailed investigation of temporal characteristics of mechanisms mediating blindsight is only reported in one subject (GY). It is of interest to establish...
Gespeichert in:
| Veröffentlicht in: | Neuropsychologia 2003, Vol.41 (10), p.1296-1306 |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 1306 |
|---|---|
| container_issue | 10 |
| container_start_page | 1296 |
| container_title | Neuropsychologia |
| container_volume | 41 |
| creator | Trevethan, Ceri T. Sahraie, Arash |
| description | Blindsight subjects are typically better at discriminating rapid, transient visual events than those with gradual on/off-sets. Surprisingly, the detailed investigation of temporal characteristics of mechanisms mediating blindsight is only reported in one subject (GY). It is of interest to establish whether these characteristics are similar to those in other cases of blindsight. Here, we report on a systematic study of spatio-temporal properties of mechanisms mediating blindsight in a subject VN. VN has a lower right quadranopia following surgical removal of the left occipital cortex above the calcarine sulcus, therefore, there are no remaining islands of intact visual cortex within this area. Similar to GY, the blindsight mechanisms in VN have narrowly tuned band-pass temporal characteristics with a peak sensitivity at 20
Hz and above chance performance at temporal frequencies ≥10 and ≤33
Hz. The spatial channel in VN has low-pass characteristics with an upper cut-off |
| doi_str_mv | 10.1016/S0028-3932(03)00049-6 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_73291568</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0028393203000496</els_id><sourcerecordid>73291568</sourcerecordid><originalsourceid>FETCH-LOGICAL-c443t-988f8e270f6641f7a25498798bfc81b32faf8a9986e9fbd9056a3790fb23ffc63</originalsourceid><addsrcrecordid>eNqFkMlOwzAQQC0EoqXwCaBcQHAIeMlinxCq2KRKHApn4zh2cZXGwU6o-vc4bUSPnEajebM9AM4RvEUQZXdzCDGNCSP4GpIbCGHC4uwAjBHNSUxSlByC8R8yAifeL3soxfQYjBDO05xBMgaf80a0RlSRqMuoVavGupA0zkrlvakXkakjEfmuWCrZRmvTfkXSutbIQBWVqcs6cJG2VWXXPW6lNI1pQ9V3bqHc5hQcaVF5dTbECfh4enyfvsSzt-fX6cMslklC2phRqqnCOdRZliCdC5wmjOaMFlpSVBCshaaCMZoppouSwTQTJLygC0y0lhmZgKvd3HD7d6d8y1fGS1VVola28zwnmKE0owFMd6B01nunNG-cWQm34QjyXi3fquW9Nw4J36rl_YKLYUFXrFS57xpcBuByAIQPerQTtTR-zyU5xSnrB93vOBV0_BjluJdG1VKVxgXJvLTmn1N-ATWClt4</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>73291568</pqid></control><display><type>article</type><title>Spatial and temporal processing in a subject with cortical blindness following occipital surgery</title><source>MEDLINE</source><source>ScienceDirect Journals (5 years ago - present)</source><creator>Trevethan, Ceri T. ; Sahraie, Arash</creator><creatorcontrib>Trevethan, Ceri T. ; Sahraie, Arash</creatorcontrib><description>Blindsight subjects are typically better at discriminating rapid, transient visual events than those with gradual on/off-sets. Surprisingly, the detailed investigation of temporal characteristics of mechanisms mediating blindsight is only reported in one subject (GY). It is of interest to establish whether these characteristics are similar to those in other cases of blindsight. Here, we report on a systematic study of spatio-temporal properties of mechanisms mediating blindsight in a subject VN. VN has a lower right quadranopia following surgical removal of the left occipital cortex above the calcarine sulcus, therefore, there are no remaining islands of intact visual cortex within this area. Similar to GY, the blindsight mechanisms in VN have narrowly tuned band-pass temporal characteristics with a peak sensitivity at 20
Hz and above chance performance at temporal frequencies ≥10 and ≤33
Hz. The spatial channel in VN has low-pass characteristics with an upper cut-off <3.5
c/°. There is extensive spatial summation in the blindfield whereas no temporal summation was found in the time range tested (50–1600
ms). In agreement with our previous reports, pupillary responses can predict the existence of residual vision within the field defect and show similar spatial characteristics to those obtained psychophysically. The spatio-temporal characteristics of blindsight in VN reported here are similar to those reported in subjects with ischaemic lesions, suggesting that such visual capacities need not necessarily be attributed to spared areas of visual cortex.</description><identifier>ISSN: 0028-3932</identifier><identifier>EISSN: 1873-3514</identifier><identifier>DOI: 10.1016/S0028-3932(03)00049-6</identifier><identifier>PMID: 12757903</identifier><identifier>CODEN: NUPSA6</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Adult ; Adult and adolescent clinical studies ; Biological and medical sciences ; Blindness, Cortical - complications ; Blindness, Cortical - etiology ; Blindsight ; Female ; Humans ; Medical sciences ; Mental Processes ; Occipital Lobe - pathology ; Occipital Lobe - surgery ; Organic mental disorders. Neuropsychology ; Psychology. Psychoanalysis. Psychiatry ; Psychopathology. Psychiatry ; Space Perception ; Spatial summation ; Spatial vision ; Temporal Lobe - physiology ; Temporal processing ; Temporal summation ; Visual awareness ; Visual Perception</subject><ispartof>Neuropsychologia, 2003, Vol.41 (10), p.1296-1306</ispartof><rights>2003 Elsevier Science Ltd</rights><rights>2003 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c443t-988f8e270f6641f7a25498798bfc81b32faf8a9986e9fbd9056a3790fb23ffc63</citedby><cites>FETCH-LOGICAL-c443t-988f8e270f6641f7a25498798bfc81b32faf8a9986e9fbd9056a3790fb23ffc63</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0028-3932(03)00049-6$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,4024,27923,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=14782596$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12757903$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Trevethan, Ceri T.</creatorcontrib><creatorcontrib>Sahraie, Arash</creatorcontrib><title>Spatial and temporal processing in a subject with cortical blindness following occipital surgery</title><title>Neuropsychologia</title><addtitle>Neuropsychologia</addtitle><description>Blindsight subjects are typically better at discriminating rapid, transient visual events than those with gradual on/off-sets. Surprisingly, the detailed investigation of temporal characteristics of mechanisms mediating blindsight is only reported in one subject (GY). It is of interest to establish whether these characteristics are similar to those in other cases of blindsight. Here, we report on a systematic study of spatio-temporal properties of mechanisms mediating blindsight in a subject VN. VN has a lower right quadranopia following surgical removal of the left occipital cortex above the calcarine sulcus, therefore, there are no remaining islands of intact visual cortex within this area. Similar to GY, the blindsight mechanisms in VN have narrowly tuned band-pass temporal characteristics with a peak sensitivity at 20
Hz and above chance performance at temporal frequencies ≥10 and ≤33
Hz. The spatial channel in VN has low-pass characteristics with an upper cut-off <3.5
c/°. There is extensive spatial summation in the blindfield whereas no temporal summation was found in the time range tested (50–1600
ms). In agreement with our previous reports, pupillary responses can predict the existence of residual vision within the field defect and show similar spatial characteristics to those obtained psychophysically. The spatio-temporal characteristics of blindsight in VN reported here are similar to those reported in subjects with ischaemic lesions, suggesting that such visual capacities need not necessarily be attributed to spared areas of visual cortex.</description><subject>Adult</subject><subject>Adult and adolescent clinical studies</subject><subject>Biological and medical sciences</subject><subject>Blindness, Cortical - complications</subject><subject>Blindness, Cortical - etiology</subject><subject>Blindsight</subject><subject>Female</subject><subject>Humans</subject><subject>Medical sciences</subject><subject>Mental Processes</subject><subject>Occipital Lobe - pathology</subject><subject>Occipital Lobe - surgery</subject><subject>Organic mental disorders. Neuropsychology</subject><subject>Psychology. Psychoanalysis. Psychiatry</subject><subject>Psychopathology. Psychiatry</subject><subject>Space Perception</subject><subject>Spatial summation</subject><subject>Spatial vision</subject><subject>Temporal Lobe - physiology</subject><subject>Temporal processing</subject><subject>Temporal summation</subject><subject>Visual awareness</subject><subject>Visual Perception</subject><issn>0028-3932</issn><issn>1873-3514</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkMlOwzAQQC0EoqXwCaBcQHAIeMlinxCq2KRKHApn4zh2cZXGwU6o-vc4bUSPnEajebM9AM4RvEUQZXdzCDGNCSP4GpIbCGHC4uwAjBHNSUxSlByC8R8yAifeL3soxfQYjBDO05xBMgaf80a0RlSRqMuoVavGupA0zkrlvakXkakjEfmuWCrZRmvTfkXSutbIQBWVqcs6cJG2VWXXPW6lNI1pQ9V3bqHc5hQcaVF5dTbECfh4enyfvsSzt-fX6cMslklC2phRqqnCOdRZliCdC5wmjOaMFlpSVBCshaaCMZoppouSwTQTJLygC0y0lhmZgKvd3HD7d6d8y1fGS1VVola28zwnmKE0owFMd6B01nunNG-cWQm34QjyXi3fquW9Nw4J36rl_YKLYUFXrFS57xpcBuByAIQPerQTtTR-zyU5xSnrB93vOBV0_BjluJdG1VKVxgXJvLTmn1N-ATWClt4</recordid><startdate>2003</startdate><enddate>2003</enddate><creator>Trevethan, Ceri T.</creator><creator>Sahraie, Arash</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>2003</creationdate><title>Spatial and temporal processing in a subject with cortical blindness following occipital surgery</title><author>Trevethan, Ceri T. ; Sahraie, Arash</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c443t-988f8e270f6641f7a25498798bfc81b32faf8a9986e9fbd9056a3790fb23ffc63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Adult</topic><topic>Adult and adolescent clinical studies</topic><topic>Biological and medical sciences</topic><topic>Blindness, Cortical - complications</topic><topic>Blindness, Cortical - etiology</topic><topic>Blindsight</topic><topic>Female</topic><topic>Humans</topic><topic>Medical sciences</topic><topic>Mental Processes</topic><topic>Occipital Lobe - pathology</topic><topic>Occipital Lobe - surgery</topic><topic>Organic mental disorders. Neuropsychology</topic><topic>Psychology. Psychoanalysis. Psychiatry</topic><topic>Psychopathology. Psychiatry</topic><topic>Space Perception</topic><topic>Spatial summation</topic><topic>Spatial vision</topic><topic>Temporal Lobe - physiology</topic><topic>Temporal processing</topic><topic>Temporal summation</topic><topic>Visual awareness</topic><topic>Visual Perception</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Trevethan, Ceri T.</creatorcontrib><creatorcontrib>Sahraie, Arash</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Neuropsychologia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Trevethan, Ceri T.</au><au>Sahraie, Arash</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spatial and temporal processing in a subject with cortical blindness following occipital surgery</atitle><jtitle>Neuropsychologia</jtitle><addtitle>Neuropsychologia</addtitle><date>2003</date><risdate>2003</risdate><volume>41</volume><issue>10</issue><spage>1296</spage><epage>1306</epage><pages>1296-1306</pages><issn>0028-3932</issn><eissn>1873-3514</eissn><coden>NUPSA6</coden><abstract>Blindsight subjects are typically better at discriminating rapid, transient visual events than those with gradual on/off-sets. Surprisingly, the detailed investigation of temporal characteristics of mechanisms mediating blindsight is only reported in one subject (GY). It is of interest to establish whether these characteristics are similar to those in other cases of blindsight. Here, we report on a systematic study of spatio-temporal properties of mechanisms mediating blindsight in a subject VN. VN has a lower right quadranopia following surgical removal of the left occipital cortex above the calcarine sulcus, therefore, there are no remaining islands of intact visual cortex within this area. Similar to GY, the blindsight mechanisms in VN have narrowly tuned band-pass temporal characteristics with a peak sensitivity at 20
Hz and above chance performance at temporal frequencies ≥10 and ≤33
Hz. The spatial channel in VN has low-pass characteristics with an upper cut-off <3.5
c/°. There is extensive spatial summation in the blindfield whereas no temporal summation was found in the time range tested (50–1600
ms). In agreement with our previous reports, pupillary responses can predict the existence of residual vision within the field defect and show similar spatial characteristics to those obtained psychophysically. The spatio-temporal characteristics of blindsight in VN reported here are similar to those reported in subjects with ischaemic lesions, suggesting that such visual capacities need not necessarily be attributed to spared areas of visual cortex.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><pmid>12757903</pmid><doi>10.1016/S0028-3932(03)00049-6</doi><tpages>11</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0028-3932 |
| ispartof | Neuropsychologia, 2003, Vol.41 (10), p.1296-1306 |
| issn | 0028-3932 1873-3514 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_73291568 |
| source | MEDLINE; ScienceDirect Journals (5 years ago - present) |
| subjects | Adult Adult and adolescent clinical studies Biological and medical sciences Blindness, Cortical - complications Blindness, Cortical - etiology Blindsight Female Humans Medical sciences Mental Processes Occipital Lobe - pathology Occipital Lobe - surgery Organic mental disorders. Neuropsychology Psychology. Psychoanalysis. Psychiatry Psychopathology. Psychiatry Space Perception Spatial summation Spatial vision Temporal Lobe - physiology Temporal processing Temporal summation Visual awareness Visual Perception |
| title | Spatial and temporal processing in a subject with cortical blindness following occipital surgery |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-07T04%3A32%3A34IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Spatial%20and%20temporal%20processing%20in%20a%20subject%20with%20cortical%20blindness%20following%20occipital%20surgery&rft.jtitle=Neuropsychologia&rft.au=Trevethan,%20Ceri%20T.&rft.date=2003&rft.volume=41&rft.issue=10&rft.spage=1296&rft.epage=1306&rft.pages=1296-1306&rft.issn=0028-3932&rft.eissn=1873-3514&rft.coden=NUPSA6&rft_id=info:doi/10.1016/S0028-3932(03)00049-6&rft_dat=%3Cproquest_cross%3E73291568%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=73291568&rft_id=info:pmid/12757903&rft_els_id=S0028393203000496&rfr_iscdi=true |