Publicação
Beyond words : a study of local versus global shape processing in dyslexic readers
| Resumo: | Two processing styles are involved in visual identification of letters/words and objects: either part-based (analytic, local) or holistic (global) processing. Compared with typical readers, dyslexic readers tend to have difficulties implementing local processing to written letters and words. This thesis aimed to explore if these difficulties are restricted to the verbal domain or are more general, affecting the processing of non-linguistic objects. To do so, two experiments were conducted with dyslexic adults and age-matched typical readers to examine object recognition. In Experiment 1, participants performed an object naming task in which we orthogonally manipulated the objects configuration (objects recognized from their global shape vs. objects whose recognition depended on their internal detail) and their visibility (blurred vs. non-blurred images). In Experiment 2, a subset of the same participants performed a difficult object decision task and a superordinate object categorization task (same stimuli) which was assumed to require less object individuation. Relative to controls, dyslexic readers’ performance was especially poor (longer RTs) for “internal detail” objects, exacerbated under difficult encoding contexts (blurred images; Experiment 1), and in a task where (presumably) a coarse global shape processing strategy did not suffice for successful object recognition and consequently participants needed to base also on local shape information (i.e., object decision task; Experiment 2). These results seem to suggest that dyslexics process objects in a different manner than controls, and specifically that they could be impaired at part-based processing for object identification. This extends previous findings for written letters/words, hence, are not domain-specific. |
|---|---|
| Autores principais: | Dias, Diana Sofia Gonçalves |
| Assunto: | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| _version_ | 1865920850529615872 |
|---|---|
| author | Dias, Diana Sofia Gonçalves |
| author_facet | Dias, Diana Sofia Gonçalves Dias, Diana Sofia Gonçalves |
| author_role | author |
| contributor_name_str_mv | Araújo, Susana Silva Bramão, Maria Inês Neto, 1981- Repositório Científico de Acesso Aberto da ULisboa |
| country_str | PT |
| creators_json_str | [{\"Person.name\":\"Dias, Diana Sofia Gonçalves\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Araújo, Susana Silva Bramão, Maria Inês Neto, 1981- Repositório Científico de Acesso Aberto da ULisboa |
| datacite.creators.creator.creatorName.fl_str_mv | Dias, Diana Sofia Gonçalves |
| datacite.date.Accepted.fl_str_mv | 2021-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2023-01-24T15:26:58Z |
| datacite.date.embargoed.fl_str_mv | 2023-01-24T15:26:58Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| datacite.titles.title.fl_str_mv | Beyond words : a study of local versus global shape processing in dyslexic readers |
| dc.contributor.none.fl_str_mv | Araújo, Susana Silva Bramão, Maria Inês Neto, 1981- Repositório Científico de Acesso Aberto da ULisboa |
| dc.creator.none.fl_str_mv | Dias, Diana Sofia Gonçalves |
| dc.date.Accepted.fl_str_mv | 2021-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2023-01-24T15:26:58Z |
| dc.date.embargoed.fl_str_mv | 2023-01-24T15:26:58Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10451/55996 |
| dc.language.none.fl_str_mv | eng |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| dc.title.fl_str_mv | Beyond words : a study of local versus global shape processing in dyslexic readers |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_bdcc |
| description | Two processing styles are involved in visual identification of letters/words and objects: either part-based (analytic, local) or holistic (global) processing. Compared with typical readers, dyslexic readers tend to have difficulties implementing local processing to written letters and words. This thesis aimed to explore if these difficulties are restricted to the verbal domain or are more general, affecting the processing of non-linguistic objects. To do so, two experiments were conducted with dyslexic adults and age-matched typical readers to examine object recognition. In Experiment 1, participants performed an object naming task in which we orthogonally manipulated the objects configuration (objects recognized from their global shape vs. objects whose recognition depended on their internal detail) and their visibility (blurred vs. non-blurred images). In Experiment 2, a subset of the same participants performed a difficult object decision task and a superordinate object categorization task (same stimuli) which was assumed to require less object individuation. Relative to controls, dyslexic readers’ performance was especially poor (longer RTs) for “internal detail” objects, exacerbated under difficult encoding contexts (blurred images; Experiment 1), and in a task where (presumably) a coarse global shape processing strategy did not suffice for successful object recognition and consequently participants needed to base also on local shape information (i.e., object decision task; Experiment 2). These results seem to suggest that dyslexics process objects in a different manner than controls, and specifically that they could be impaired at part-based processing for object identification. This extends previous findings for written letters/words, hence, are not domain-specific. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | masterThesis |
| fulltext.url.fl_str_mv | https://repositorio.ulisboa.pt/bitstreams/b262143c-d2cb-44ab-bfc1-824dee49a989/download |
| id | ul_ef7da35905d8d79cbf64af5e031bb473 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10451/55996 |
| instacron_str | ul |
| institution | Universidade de Lisboa |
| instname_str | Universidade de Lisboa |
| language | eng |
| network_acronym_str | ul |
| network_name_str | Repositório da Universidade de Lisboa |
| oai_identifier_str | oai:repositorio.ulisboa.pt:10451/55996 |
| organization_str_mv | urn:organizationAcronym:ul |
| person_str_mv | Dias, Diana Sofia Gonçalves |
| publishDate | 2021 |
| reponame_str | Repositório da Universidade de Lisboa |
| repository_id_str | urn:repositoryAcronym:ul |
| service_str_mv | urn:repositoryAcronym:ul |
| spelling | engpt_PTTwo processing styles are involved in visual identification of letters/words and objects: either part-based (analytic, local) or holistic (global) processing. Compared with typical readers, dyslexic readers tend to have difficulties implementing local processing to written letters and words. This thesis aimed to explore if these difficulties are restricted to the verbal domain or are more general, affecting the processing of non-linguistic objects. To do so, two experiments were conducted with dyslexic adults and age-matched typical readers to examine object recognition. In Experiment 1, participants performed an object naming task in which we orthogonally manipulated the objects configuration (objects recognized from their global shape vs. objects whose recognition depended on their internal detail) and their visibility (blurred vs. non-blurred images). In Experiment 2, a subset of the same participants performed a difficult object decision task and a superordinate object categorization task (same stimuli) which was assumed to require less object individuation. Relative to controls, dyslexic readers’ performance was especially poor (longer RTs) for “internal detail” objects, exacerbated under difficult encoding contexts (blurred images; Experiment 1), and in a task where (presumably) a coarse global shape processing strategy did not suffice for successful object recognition and consequently participants needed to base also on local shape information (i.e., object decision task; Experiment 2). These results seem to suggest that dyslexics process objects in a different manner than controls, and specifically that they could be impaired at part-based processing for object identification. This extends previous findings for written letters/words, hence, are not domain-specific.application/pdfpt_PTBeyond words : a study of local versus global shape processing in dyslexic readersDias, Diana Sofia GonçalvesAraújo, Susana SilvaBramão, Maria Inês Neto, 1981-HostingInstitutionOrganizationalRepositório Científico de Acesso Aberto da ULisboae-mailmailto:repositorio@reitoria.ulisboa.ptrepositorio@reitoria.ulisboa.ptURNurn:tid:2032712112023-01-24T15:26:58Z20212021-12-102021-01-01T00:00:00ZHandlehttp://hdl.handle.net/10451/55996http://purl.org/coar/access_right/c_abf2open accessDislexiaReconhecimento visualProcessos cognitivosDissertações de mestrado - 2021679063 bytesliteraturehttp://purl.org/coar/resource_type/c_bdccmaster thesishttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://repositorio.ulisboa.pt/bitstreams/b262143c-d2cb-44ab-bfc1-824dee49a989/download |
| spellingShingle | Beyond words : a study of local versus global shape processing in dyslexic readers Beyond words : a study of local versus global shape processing in dyslexic readers Dias, Diana Sofia Gonçalves Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 Dias, Diana Sofia Gonçalves Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| status | SINGLETON |
| subject.fl_str_mv | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| title | Beyond words : a study of local versus global shape processing in dyslexic readers |
| title_full | Beyond words : a study of local versus global shape processing in dyslexic readers |
| title_fullStr | Beyond words : a study of local versus global shape processing in dyslexic readers Beyond words : a study of local versus global shape processing in dyslexic readers |
| title_full_unstemmed | Beyond words : a study of local versus global shape processing in dyslexic readers Beyond words : a study of local versus global shape processing in dyslexic readers |
| title_short | Beyond words : a study of local versus global shape processing in dyslexic readers |
| title_sort | Beyond words : a study of local versus global shape processing in dyslexic readers |
| topic | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| topic_facet | Dislexia Reconhecimento visual Processos cognitivos Dissertações de mestrado - 2021 |
| url | http://hdl.handle.net/10451/55996 |
| visible | 1 |