Complex cells can be found in the primary visual cortex (V1),[1] the secondary visual cortex (V2), and Brodmann area 19 (V3).[2]
Like a simple cell, a complex cell will respond primarily to oriented edges and gratings, however it has a degree of spatial invariance. This means that its receptive field cannot be mapped into fixed excitatory and inhibitory zones. Rather, it will respond to patterns of light in a certain orientation within a large receptive field, regardless of the exact location. Some complex cells respond optimally only to movement in a certain direction.
These cells were discovered by Torsten Wiesel and David Hubel in the early 1960s.[1] They refrained from reporting on the complex cells in (Hubel 1959) because they did not feel that they understood them well enough at the time.[3] In Hubel and Wiesel (1962),[1] they reported that complex cells were intermixed with simple cells and when excitatory and inhibitory regions could be established, the summation and mutual antagonism properties didn't hold.
The difference between the receptive fields and the characteristics of simple and complex cells is the hierarchical convergent nature of visual processing. Complex cells receive inputs from a number of simple cells. Their receptive field is therefore a summation and integration of the receptive fields of many input simple cells, although some input is directly received from the LGN.[4] The manner through which simple cells are able to make up complex cells is not fully understood. A simple addition of receptive fields would result in complex cells manifesting observable, separate excitatory/inhibitory regions, which is not the case.
^ abcHubel DH, Wiesel TN (January 1962). "Receptive fields, binocular interaction and functional architecture in the cat's visual cortex". The Journal of Physiology. 160 (1): 106–54. doi:10.1113/jphysiol.1962.sp006837. PMC 1359523. PMID 14449617.
^Hubel DH, Wiesel TN (March 1965). "Receptive Fields and Functional Architecture in Two Nonstriate Visual Areas (18 and 19) of the Cat". Journal of Neurophysiology. 28 (2): 229–89. doi:10.1152/jn.1965.28.2.229. PMID 14283058.
^Wiesel, David H.; Hubel, Torsten N. (2005). Brain and visual perception : the story of a 25-year collaboration ([Online-Ausg.]. ed.). New York, N.Y.: Oxford University Press. ISBN 978-0-19-517618-6.
^Palmer, Stephen E. (1999). Vision Science: Photons to Phenomenology. Cambridge: The MIT Press. p. 153. ISBN 978-0-262-16183-1.
Complexcells can be found in the primary visual cortex (V1), the secondary visual cortex (V2), and Brodmann area 19 (V3). Like a simple cell, a complex...
A CW complex (also called cellular complex or cellcomplex) is a kind of a topological space that is particularly important in algebraic topology. It...
up cell in Wiktionary, the free dictionary. Cell most often refers to: Cell (biology), the functional basic unit of life Cell may also refer to: Cell (comics)...
the complex transcription machinery, the membrane-sorting systems, the nuclear pore, and some enzymes in the biochemical pathways. Eukaryote cells include...
Hypercomplex cells were originally characterized as the superordinate class of visual processing cells above complex and simple cells. Whereas complexcells were...
In mathematics, an abstract cellcomplex is an abstract set with Alexandrov topology in which a non-negative integer number called dimension is assigned...
Cell junctions or junctional complexes are a class of cellular structures consisting of multiprotein complexes that provide contact or adhesion between...
Cell division is the process by which a parent cell divides into two daughter cells. Cell division usually occurs as part of a larger cell cycle in which...
The cell cycle, or cell-division cycle, is the sequential series of events that take place in a cell that causes it to divide into two daughter cells. These...
a serine/threonine protein kinase that regulates cell growth, cell proliferation, cell motility, cell survival, protein synthesis, autophagy, and transcription...
Mycobacterium species are non-pathogenic, the genus' characteristic complexcell wall contributes to evasion from host defenses. Mycobacteria are aerobic...
grating cell does not respond when seeing an isolated bar. Using the mathematical Gabor model with sine and cosine components (phases), complexcells are...
secreted by various cells, primarily fibroblasts, as a soluble protein dimer and is then assembled into an insoluble matrix in a complexcell-mediated process...
The T helper cells (Th cells), also known as CD4+ cells or CD4-positive cells, are a type of T cell that play an important role in the adaptive immune...
cell. If the TCR is specific for that antigen, it binds to the complex of the class I MHC molecule and the antigen, and the T cell destroys the cell....
Each cell in a cellcomplex is homeomorphic to an open ball, attached together via attaching maps. Boundary cells of each cell in a cellcomplex are also...
A multicellular organism is an organism that consists of more than one cell, in contrast to unicellular organism. All species of animals, land plants and...
immature ovum is located is the cell-nest. The cumulus-oocyte complex contains layers of tightly packed cumulus cells surrounding the oocyte in the Graafian...
A cell wall is a structural layer that surrounds some cell types, found immediately outside the cell membrane. It can be tough, flexible, and sometimes...
membrane attack complex (MAC) or terminal complement complex (TCC) is a complex of proteins typically formed on the surface of pathogen cell membranes as...
to T cells as peptide pieces in complex with MHC-II molecules on the cell membrane. T helper (TH) cells, typically follicular T helper (TFH) cells recognize...
of a T-cell receptor (TCR) on their cell surface. T cells are born from hematopoietic stem cells, found in the bone marrow. Developing T cells then migrate...
A mitochondrion (pl. mitochondria) is an organelle found in the cells of most eukaryotes, such as animals, plants and fungi. Mitochondria have a double...