Division of labor between M and P visual pathways: different visual pathways minimize joint entropy differently

• Autor(a) principal: Silveira,Luiz Carlos de Lima
• Data de Publicação: 2008
• Outros Autores: Saito,Cézar Akiyoshi, Mello Jr.,Harold Dias de, Silveira,Vladímir de Aquino, Souza,Givago da Silva, Rodrigues,Anderson Raiol, Silva Filho,Manoel da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Psychology & Neuroscience (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-32882008000100002
• topic: vision; M and P pathways; visual parallel processing; fourier space; joint entropy; information theory

Visual perception and action are strongly linked with parallel processing channels connecting the retina, the lateral geniculate nucleus, and the input layers of the primary visual cortex. Achromatic vision is provided by at least two of such channels formed by the M and P neurons. These cell pathways are similarly organized in primates having different lifestyles, including species that are diurnal, nocturnal, and which exhibit a variety of color vision phenotypes. We describe the M and P cell properties by 3D Gábor functions and their 3D Fourier transform. The M and P cells occupy different loci in the Gábor information diagram or Fourier Space. This separation allows the M and P pathways to transmit visual signals with distinct 6D joint entropy for space, spatial frequency, time, and temporal frequency. By combining the M and P impacts on the cortical neurons beyond V1 input layers, the cortical pathways are able to process aspects of visual stimuli with a better precision than it would be possible using the M or P pathway alone. This performance fulfils the requirements of different behavioral tasks.