期刊
CEREBRAL CORTEX
卷 15, 期 4, 页码 460-478出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhh148
关键词
extrastriate visual cortex; optical imaging; parietal cortex; spatial perception; visual fields; visual pathways
资金
- NCRR NIH HHS [S10 RR012873-01, 1S10RR-12873] Funding Source: Medline
- NEI NIH HHS [R01 EY009223, R01 EY009223-07, R01 EY009223-05A2, R01 EY009223-06, EY-09223, R01 EY009223-08] Funding Source: Medline
While the receptive field properties of single neurons in the inferior parietal cortex have been quantitatively described from numerous electrical measurements, the visual topography of area 7a and the adjacent dorsal prelunate area (DP) remains unknown. This lacuna may be a technical byproduct of the difficulty of reconstructing tens to hundreds of penetrations, or may be the result of varying functional retinotopic architectures. Intrinsic optical imaging, performed in behaving monkey for extended periods of time, was used to evaluate retinotopy simultaneously at multiple positions across the cortical surface. As electrical recordings through an implanted artificial dura are difficult, the measurement and quantification of retinotopy with long-term recordings was validated by imaging early visual cortex (areas V1 and V2). Retinotopic topography was found in each of the three other areas studied within a single day's experiment. However, the ventral portion of DP (DPv) had a retinotopic topography that varied from day to day, while the more dorsal aspects (DPd) exhibited consistent retinotopy. This suggests that the dorsal prelunate gyrus may consist of more than one visual area. The retinotopy of area 7a also varied from day to day. Possible mechanisms for this variability across days are discussed as well as its impact upon our understanding of the representation of extrapersonal space in the inferior parietal cortex.
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