Inmacaque,severalvisualareasaredevotedtoanalyzemotioninthevisualfield,andV6isoneoftheseareas.Inmacaque,areaV6occupiestheventralpartoftheanteriorbankoftheparieto-occipitalsulcus(POs),isretinotopically-organizedandcontainsapoint-to-pointrepresentationoftheretinalsurface.V6isamotionsensitiveareathatlargelyrepresentstheperipheralpartofthevisualfieldandwhosecellsareverysensitivetotranslationalmotio.BasedonthefactthatmacaqueV6containsmanyreal-motioncells,ithasbeensuggestedthatV6isinvolvedinobject-motionrecognition.Recently,areaV6hasbeenrecognizedalsointhehumanbrainbyneuroimagingandelectrophysiologicalmethods.LikemacaqueV6,humanV6islocatedinthePOs,isretinotopicallyorganized,andrepresentstheentirecontralateralhemifielduptothefarperiphery.HumanV6,likemacaqueV6,isamotionareathatrespondstounidirectionalmotion.IthasastrongpreferenceforcoherentmotionandarecentcombinedVEPs/fMRIworkhasshownthatareaV6isevenoneofthemostearlystationscodingthemotioncoherence.HumanV6ishighlysensitivetoflowfieldandisalsoabletodistinguishbetweendifferent3DflowfieldsbeingselectivetotranslationalegomotionThissuggeststhatthisareaprocessesvisualegomotionsignalstoextractinformationabouttherelativedistanceofobjects,likelyinordertoactonthem,ortoavoidthem.TheviewthatV6isinvolvedintheestimationofegomotionhasbeentestedalsoinotherrecentfMRIstudies.Thus,takentogether,humanandmacaquedatasuggestthatV6isinvolvedinbothobjectandself-motionrecognition.Specifically,V6couldbeinvolvedin“subtractingout”self-motionsignalsacrossthewholevisualfieldandinprovidinginformationaboutmovingobjects,particularlyduringself-motioninacomplexanddynamicallyunstableenvironment.
S. Pitzalis, P. Fattori, C. Galletti (2013). The functional role of the medial motion area V6. FRONTIERS IN BEHAVIORAL NEUROSCIENCE, 6, 1-13 [10.3389/fnbeh.2012.00091.].
The functional role of the medial motion area V6.
FATTORI, PATRIZIA;GALLETTI, CLAUDIO
2013
Abstract
Inmacaque,severalvisualareasaredevotedtoanalyzemotioninthevisualfield,andV6isoneoftheseareas.Inmacaque,areaV6occupiestheventralpartoftheanteriorbankoftheparieto-occipitalsulcus(POs),isretinotopically-organizedandcontainsapoint-to-pointrepresentationoftheretinalsurface.V6isamotionsensitiveareathatlargelyrepresentstheperipheralpartofthevisualfieldandwhosecellsareverysensitivetotranslationalmotio.BasedonthefactthatmacaqueV6containsmanyreal-motioncells,ithasbeensuggestedthatV6isinvolvedinobject-motionrecognition.Recently,areaV6hasbeenrecognizedalsointhehumanbrainbyneuroimagingandelectrophysiologicalmethods.LikemacaqueV6,humanV6islocatedinthePOs,isretinotopicallyorganized,andrepresentstheentirecontralateralhemifielduptothefarperiphery.HumanV6,likemacaqueV6,isamotionareathatrespondstounidirectionalmotion.IthasastrongpreferenceforcoherentmotionandarecentcombinedVEPs/fMRIworkhasshownthatareaV6isevenoneofthemostearlystationscodingthemotioncoherence.HumanV6ishighlysensitivetoflowfieldandisalsoabletodistinguishbetweendifferent3DflowfieldsbeingselectivetotranslationalegomotionThissuggeststhatthisareaprocessesvisualegomotionsignalstoextractinformationabouttherelativedistanceofobjects,likelyinordertoactonthem,ortoavoidthem.TheviewthatV6isinvolvedintheestimationofegomotionhasbeentestedalsoinotherrecentfMRIstudies.Thus,takentogether,humanandmacaquedatasuggestthatV6isinvolvedinbothobjectandself-motionrecognition.Specifically,V6couldbeinvolvedin“subtractingout”self-motionsignalsacrossthewholevisualfieldandinprovidinginformationaboutmovingobjects,particularlyduringself-motioninacomplexanddynamicallyunstableenvironment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
