Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THE PROCESSING OF FIRST-ORDER AND 2ND-ORDER MOTION IN HUMAN VISUAL-CORTEX ASSESSED BY FUNCTIONAL MAGNETIC-RESONANCE-IMAGING (FMRI)
Autore:
SMITH AT; GREENLEE MW; SINGH KD; KRAEMER FM; HENNIG J;
Indirizzi:
UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PSYCHOL EGHAM TW200EX SURREY ENGLAND UNIV FREIBURG,NEUROL & RADIOL KLINIKEN D-79106 FREIBURG GERMANY
Titolo Testata:
The Journal of neuroscience
fascicolo: 10, volume: 18, anno: 1998,
pagine: 3816 - 3830
SICI:
0270-6474(1998)18:10<3816:TPOFA2>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR TEMPORAL SULCUS; 2ND-ORDER MOTION; MACAQUE MONKEY; EXTRASTRIATE CORTEX; BRAIN-DAMAGE; AREAS; PERCEPTION; CONTRAST; FIELD; ORGANIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
A.T. Smith et al., "THE PROCESSING OF FIRST-ORDER AND 2ND-ORDER MOTION IN HUMAN VISUAL-CORTEX ASSESSED BY FUNCTIONAL MAGNETIC-RESONANCE-IMAGING (FMRI)", The Journal of neuroscience, 18(10), 1998, pp. 3816-3830

Abstract

We have examined the activity levels produced in various areas of thehuman occipital cortex in response to various motion stimuli using functional magnetic resonance imaging (fMRI) methods. In addition to standard luminance-defined (first-order) motion, three types of second-order motion were used. The areas examined were the motion area V5 (MT) and the following areas that were delineated using retinotopic mappingprocedures: V1, V2, V3, VP, V3A, and a new area that we refer to as V3B. Area V5 is strongly activated by second-order as well as by first-order motion. This activation is highly motion-specific. Areas V1 and V2 give good responses to all motion stimuli, but the activity seems to be related primarily to the local spatial and temporal structure in the image rather than to motion processing. Area V3 and its ventral counterpart VP also respond well to all our stimuli and show a slightly greater degree of motion specificity than do V1 and V2. Unlike V1 and V2, the response in V3 and VP is significantly greater for second-order motion than for first-order motion. This trend is evident, but less marked, in V3A and V3B and absent in V5. The results are consistent with the hypothesis that first-order motion sensitivity arises in V1, that second-order motion is first represented explicitly in V3 and VP, and that V5 land perhaps also V3A and V3B) is involved in further processing of motion information, including the integration of motion signals of the two types.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 11:37:44