PMID: 1207794Jan 1, 1975Paper

Differences in the functional organization of the frog and cat visual centers

Neir̆ofiziologiia = Neurophysiology
L I Mkrtycheva, V G Samsonova

Abstract

Functional characteristics of neuronal responses of the frog tectum and the cat primary visual cortex were obtained under identical experimental conditions, the intensity and duration of flashes changing within the limits of 6 log. units. The comparison of the characteristics reveals a predominance of neurons with a short summation time and relatively lower thresholds in frogs, the response latencies being 5--7 times longer than those in cats. Nearly all the tectum units can react only to a very narrow range of photic energy different for different cells. In cats most cells react to changes in brightness within a range of 4--5 log. units; the units with a long summation time produce short latency responses with relatively higher thresholds. The revealed differences and comparison of various functional characteristics of neurons in the visual centre of both animals show that frogs possess fixed mechanisms of time and spatial interaction providing for the detection of stimulus brightness by means of inhibitory interaction of single units. In cats such interaction of neural populations and mutual inhibition between adjacent units of the visual cortex are not prominent. Complication and overlapping of interneuronal connections resu...Continue Reading

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.