{"id":8674,"date":"2019-05-22T16:10:17","date_gmt":"2019-05-22T16:10:17","guid":{"rendered":"http:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/p400\/"},"modified":"2019-05-22T16:10:17","modified_gmt":"2019-05-22T16:10:17","slug":"p400","status":"publish","type":"post","link":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/p400\/","title":{"rendered":"P400"},"content":{"rendered":"<p>A specific positive component of the event-related potential, thought to be elicited by faces, and observed in <a href=\"http:\/\/www.cbcd.bbk.ac.uk\/people\/scientificstaff\/mark\/PDFs\/Development_of_Face_Sensitive\" class=\"cc-route-enabled\" data-editable-link=\"http:\/\/www.cbcd.bbk.ac.uk\/people\/scientificstaff\/mark\/PDFs\/Development_of_Face_Sensitive?target=_self\" target=\"_self\" rel=\"noopener noreferrer\">infants<\/a> but not adults. &nbsp;It has been suggested to be a precursor to the negative component N170 compared to which it differs not only in polarity, but also peaks at a later latency. &nbsp;These peak latencies decrease from 450 to 390 ms between 3 and 12 months-of-age, being most evident over posterior and lateral electrodes. &nbsp;However, P400 shares a couple of similarities with the adult N170 even though it is opposite in polarity and has a later latency that the adult N170: both are prominent at the lateral than medial electrodes, and for both the peak latency is faster for faces than for objects. &nbsp;In a <a href=\"http:\/\/people.umass.edu\/lscott\/publications\/LScott_Perception.pdf\" class=\"cc-route-enabled\" data-editable-link=\"http:\/\/people.umass.edu\/lscott\/publications\/LScott_Perception.pdf?target=_self\" target=\"_self\" rel=\"noopener noreferrer\">study<\/a>&nbsp; exploring the featural and configural information involved in face processing, it was found that the P400 in 8 month- relative to 4 month-old infants almost mirrored the pattern of outcomes for N170 in adults: greater featural changes in the left compared to the right hemisphere, equal amplitude in the configural changes across both hemispheres, and a greater amplitude in response to the configural rather than featural changes in the right hemisphere. &nbsp;These findings, among others, led to the conclusion that indeed P400 constitutes a developmental precursor to N170. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<\/p>\n<p>See <a href=\"event-related_-brain-_potentials_-erps-\">Event-related (brain) potentials (ERPs)<\/a>, <a href=\"face_processing\">Face processing<\/a>, <a href=\"n170\">N170<\/a><\/p>\n<p><\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A specific positive component of the event-related potential, thought to be elicited by faces, and observed in infants but not adults. &nbsp;It has been suggested to be a precursor to the negative component N170 compared to which it differs not only in polarity, but also peaks at a later latency. &nbsp;These peak latencies decrease from &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/p400\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;P400&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-8674","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-glossary","entry"],"_links":{"self":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8674","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/comments?post=8674"}],"version-history":[{"count":0,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/posts\/8674\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/media?parent=8674"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/categories?post=8674"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lancaster.ac.uk\/fas\/psych\/glossary\/wp-json\/wp\/v2\/tags?post=8674"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}