Input and output obviously are important in mediating the functions of an area, and the same area in different species can have somewhat different connections. This aspect of variability has not been studied extensively, but clear examples of variability are known. One example might be the projections from the primary visual cortex in primates to the middle temporal visual area (MT) in the temporal lobe. All primates appear to have this direct projection, but MT has not been identified in any nonprimate mammal. Thus, the projections to MT appear to be a unique feature of the primary visual cortex in primates. As a related example, evidence exists that the primary visual cortex projects to the frontal lobe in some mammals, such as rats, but not in others such as monkeys. Across species, cortical areas vary as to with which other areas and subcortical structures they are connected, the density of these connections, and the distribution of connections of specific types within an area. Most primates have few connections between the primary visual areas in the opposite cerebral hemispheres, but prosimian primates and several other mammals have many such connections.

Conquering Fear In The 21th Century

Conquering Fear In The 21th Century

The Ultimate Guide To Overcoming Fear And Getting Breakthroughs. Fear is without doubt among the strongest and most influential emotional responses we have, and it may act as both a protective and destructive force depending upon the situation.

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