{"created":"2023-05-15T08:43:37.459095+00:00","id":8658,"links":{},"metadata":{"_buckets":{"deposit":"016c7a81-b9af-4f40-886b-86cfec81d873"},"_deposit":{"created_by":13,"id":"8658","owners":[13],"pid":{"revision_id":0,"type":"depid","value":"8658"},"status":"published"},"_oai":{"id":"oai:uec.repo.nii.ac.jp:00008658","sets":["9:178"]},"author_link":["23494"],"control_number":"8658","item_10006_alternative_title_1":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"初期視覚野における遮蔽・被遮蔽物体知覚に関する計算理論","subitem_alternative_title_language":"ja"}]},"item_10006_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2018-03-23"}]},"item_10006_degree_grantor_9":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"電気通信大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12612","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_8":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_10006_description_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"2017","subitem_description_type":"Other"}]},"item_10006_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Humans can distinguish the order of mutually overlapping objects in a visual scene. The border between an occluding object and the occluded object is “owned” by the occluding object. How the brain assigns these borders, or Border-ownership  (BO)  assignment, determines the perception of object depth order. Findings from physiological experiments reveal that some neurons in area V2 of the brain respond selectively when the object which “owns” the edge in its receptive field is located on a specific side. Several models have  been  proposed  in  existing  studies  to reproduce  this  phenomenon.  However, these models are not based on a clear computational theory.\n This study is the first to approach BO assignment from a computational viewpoint by treating it as a well-defined problem. I propose that the direction of BO　assignment can be defined as a conservative vector field E(x,y) with arrowheads pointing towards the occluding object, and that information pertaining to depth order can be defined as its corresponding scalar field Φ(x,y). By using a theorem in electromagnetics which states that the gradient of electric potential is its electric field E(x,y) = ∇Φ(x,y), I demonstrate that the BO assignment problem can be　solved by updating an initial vector field until its rotation, or “curl”, is zero.\n A model developed on this computational theory can simultaneously reproduce BO assignment and perceived depth order. Results of numerical simulations agree qualitatively with the response of object-side selective neurons in V2 to stimuli containing occlusion with simple geometry. Neural networks can be deduced  from the update rule curl using only one parameter for adjusting the  scale of  neural connections. This study also presents new interpretations of existing models in addition to insight into a possible method for calculation of depth order.\n\n外界には奥行きが異なる物体が多数存在し，これら物体の視覚情報は重なりあっている場合が多い．このとき「遮蔽物体と被遮蔽物体を隔てる境界（Border）は遮蔽物体に帰属する」．Border Ownership（BO）問題は，物体の重なり順序を計算するための基盤的問題である．本研究の具体的な成果として，境界のOwnerが存在する方向であるBO信号をベクトル場E(x,y)，重なり順序をスカラー場Φ(x,y)として見なせば，電磁気学の電位と電場に関する定理（電場は電位の勾配， E(x,y) = ∇Φ(x,y)である）を用いることで問題の定式化ができることを発見した．数値シミュレーション結果から，提案モデルは様々な遮蔽状況や形状の変化に対して頑健に，BO問題と重なり順序計算問題が解けることを見出した．","subitem_description_type":"Abstract"}]},"item_10006_dissertation_number_12":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第935号"}]},"item_10006_text_22":{"attribute_name":"専攻","attribute_value_mlt":[{"subitem_text_value":"情報システム学研究科"},{"subitem_text_value":"情報メディアシステム学専攻"}]},"item_10006_text_23":{"attribute_name":"学術成果タイプ","attribute_value_mlt":[{"subitem_text_value":"博士学位論文"}]},"item_10006_version_type_18":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ZAEM ARIF, BIN ZAINAL ABIDIN","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-04-04"}],"displaytype":"detail","filename":"1560003_Thesis.pdf","filesize":[{"value":"25.6 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"1560003_Thesis.pdf","url":"https://uec.repo.nii.ac.jp/record/8658/files/1560003_Thesis.pdf"},"version_id":"b10708d5-a9bc-401c-83d1-46d23f243f19"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Computational theory of occluded-occluding object perception in early visual cortex","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Computational theory of occluded-occluding object perception in early visual cortex","subitem_title_language":"en"}]},"item_type_id":"10006","owner":"13","path":["178"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2018-04-04"},"publish_date":"2018-04-04","publish_status":"0","recid":"8658","relation_version_is_last":true,"title":["Computational theory of occluded-occluding object perception in early visual cortex"],"weko_creator_id":"13","weko_shared_id":-1},"updated":"2023-07-07T06:25:25.274546+00:00"}