Pari Talks

  Autism. P.K.Ghatak.MD No. 63. Autism literally means self-absorption. A Swedish psychologist, Paul Eugen Bleuler coined the term in 1910. Autism is found to have many variable symptoms and sometimes the conditions can go on and is correctly identified in adult life. This led to a change in name, now autism is called Autism Spectrum Disorder, ASD.  The ASD is considered as a Neurodevelopmental disorder. ASD presents behavioral and social issues, and some others consider the ASD as a discipline problem. The newborns can recognize the voice of their mother at birth; some even say the recognition of mother's voice begins in the womb. By the time the children are 2 to 3 months old, the children turn their heads to their mothers, and the facial expression of the child expresses happiness and makes eye contact with his mother. It is natural, that the mother detects lack of personal connection and apathy of the child and begins searching for an answer and soon the autism diagnosis i...

  Blog: Consciousness. A Scientific Inquiry. P.K.Ghatak, MD No.62. A flood of research papers was published recently on Consciousness. Behind the enthusiasm is a hard competition for leading a race to equip Robots with consciousness. In the past, such interests were generated when Neuroimaging technology was developed and particularly the “functional MRI” was introduced. The next wave of research papers followed after the publication of Dr. Jane Goodall's research on the social interactions and behavioral characteristics of the chimpanzees. Dr. Goodall discovered that Chimpanzees use tools, possess complex social behaviors and exhibit emotions like us. Many researchers inspired by Goodall, began working with subjects not limited only to the primates but also to birds, insects and even molluscans. One could recall Paul, the octopus who correctly picked the winning jersey of teams, 12 out of 14 times, when World Cup (soccer) was played in 2010 in Germany. What is consciousness. In th...

  The Dark Side of the Moon. P.K.Ghatak,MD Blog No.61. The moon is admired by poets and voyagers unmatched by others, even perhaps, those scientists engaged in their moon missions. In the old days the villagers and seafarers knew much more about the moon than recent science graduates. Most young men look moon with the same concerns as their mothers – they know she will be there for them when they need her and in between times, just benign neglect. This is not the worst; in the world literature there are instances where the dark spot on the moon is compared with slip of moral character of the beautiful girls and young women. It was not until the Soviet mission Luna 3 flew past the far side of the moon and photographed. It showed more rugged and have higher density of craters. The Apollo mission of the USA No. 8, 10, 11 13,16 and 17 of the USA flew by the far side of the moon and photographed this side. China came next. Her mission, Chage 4 landed on the far side of the...

  Pupil. P.K.Ghatak,MD No.60 The central aperture of the iris is the pupil. People who like talk and write British English call students as pupils. The pupils, by varying their sizes, control the amount of light that can enter the eye for us to see clearly. Pupil also serves as a passage for the aqueous humor to circulate from the posterior compartment to anterior compartment. At the periphery of the iris (No.5 in the diagram below) the aqueous humor is absorbed and goes back to the blood, Thus this process maintains the pressure of the eye ball and prevents damage to delicate structures of the retina. Aqueous humor supplies nutrients to the cornea and oxygen and nutrients to the lens. [ cristalino = lens. cuerpo ciliar = ciliary body. Canal de Schlemm = Schlemm canal, point where aqueous humor is drained from the eye back to the blood.] When light is shone in one eye, both pupils contact. This reflex action is known as direct contraction for the eye receiving the light and co...

Iris P.K.Ghatak, MD No.59 In a conversation, the word Iris generally refers to Irish, the people from Ireland. If the talk is around flowers, then Iris means a lovely delicate Iris flower. In biology the Iris is a part of the eyeball, a very delicate screen like structure which regulates the amount of light rays can enter through the center aperture, Pupil to the retina for vision. This screen is like the diaphragm of a single lens reflex camera; and both have many common features. In fact, the design of a camera is based on the eyes. Anatomical structure of human iris: The iris is thinnest at the periphery where it is attached to the ciliary muscles, and thick in the middle because the circular and radial muscle layers criss-cross in the middle of the iris The central aperture of the iris is the pupil of the eye. Contraction of circular muscles narrows the pupil and radial muscles enlarges size. Histology of iris. Structerally the iris consists oftwo distinct parts, anterior and poste...