All posts by Sumana Rao

Don't worry about the people in your past; There's a reason they didn't make it to your future.
Does Lincoln’s face look normal?

Does Lincoln’s face look normal?

It seems normal but now, look at it upright: Lincoln’s eyes do not look quite right! Some neurons in the brain seem specialized in processing faces. Faces are usually seen upright. When presented upside down, the brain no longer recognizes a picture of a face as a face but rather as an object. Neurons processing objects are different from those processing faces and not as specialized. As a consequence these neurons do not respond to face distortions as well. This explains why we miss the weird eyes when the face is inverted.


Author: Sumana Rao | Posted on: September 2, 2016
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Hermann Grid Illusion

Do you see gray dots at the intersections of the white lines?

Hermann grid illusion: There are not gray dots in this grid. However “ghost like” gray blobs are perceived at the intersections of the white lines. The gray dots disappear when looking directly at an intersection. This illusion can be explained by a neural process happening in the visual system called lateral inhibition (the capacity of an active neuron to reduce the activity of its neighbors).


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Pointing Arrows

Are the two horizontal lines of the same length?

The Mueller-Lyer Illusion: The two horizontal lines are of the same length, even though the one at the bottom seems longer. As you know, the visual angle gets smaller with distance, so the brain automatically perceives objects at farther distances to be bigger. In general, lines that have inward flaps, such as corner of a building, are relatively the nearest points of the overall object. Similarly, lines with outward flaps are found at the longer distance, as the farthest corner of a room. So in the Mueller-Lyer illusion, the brain perceives the line with outward flaps to be at a farther point as compared to the line with inward flaps. Consequently, the brain perceives the line with outward flaps to be longer.


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Elephant Illusion

How many legs does this elephant have?

This picture is an impossible picture that also contains some subjective contours, such as the Kanizsa Triangle above: A white triangle (pointing down) can be seen in this figure even though no triangle is actually drawn. This effect is known as a subjective or illusory contour. The contour of the triangle is created by the shapes around it.


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Fish In Bowl

Can you put the fish in the fishbowl?

Did you see a fish of a different color in the bowl? You have just experienced an afterimage. In the retina of your eyes, there are three types of color receptors (cones) that are most sensitive to either red, blue or green. When you stare at a particular color for too long, these receptors get “fatigued”. When you then look at a different background, the receptors that are tired do not work as well. Therefore, the information from all of the different color receptors is not in balance. This will create the color “afterimages”.


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Horizontal Lines

Are the horizontal lines straight or crooked?

Café Wall Illusion: The horizontal lines are straight, even though they do not seem straight. In this illusion, the vertical zigzag patterns disrupt our horizontal perception.


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Square Illusions

Are the squares inside the blue and yellow squares all the same color?

Bezold effect: The smaller squares inside the blue and yellow squares are all the same color. They seem different (magenta and orange) because a color is perceived differently depending on its relation to adjacent colors (here blue or yellow depending on the outer square)..


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Schizophrenia

Aerobic exercise helps to tackle Schizophrenia!

Schizophrenia is a long-term mental health condition and its acute phase is typified by hallucinations and delusions, which are usually treatable with medications.

A new study from University of Manchester researchers shows that aerobic exercise can significantly help people coping with the long-term mental health condition schizophrenia. The study by Firth, Dr Brendon Stubbs and Professor Alison Yung is published in Schizophrenia Bulletin.

Through combining data from 10 independent clinical trials with a total of 385 patients with schizophrenia, Joseph Firth found that around 12 weeks of aerobic exercise training can significant improve patients’ brain functioning. This research showed that patients who are treated with aerobic exercise programs, such as treadmills and exercise bikes, in combination with their medication, will improve their overall brain functioning more than those treated with medications alone.

Aerobic exercise can significantly help individuals improve the ‘cognitive deficits,’ especially loss of working memory linked with schizophrenia. Cognitive deficit is an inclusive term used to describe impairment in an individual’s mental processes that lead to the acquisition of information and knowledge, and drive how an individual understands and acts in the world.

Joe Firth said: “Cognitive deficits are one aspect of schizophrenia which is particularly problematic.

“They hinder recovery and impact negatively upon people’s ability to function in work and social situations. Furthermore, current medications for schizophrenia do not treat the cognitive deficits of the disorder.

“We are searching for new ways to treat these aspects of the illness, and now research is increasingly suggesting that physical exercise can provide a solution.” He added-  “These findings present the first large-scale evidence supporting the use of physical exercise to treat the neurocognitive deficits associated with schizophrenia.

“Using exercise from the earliest stages of the illness could reduce the likelihood of long-term disability, and facilitate full, functional recovery for patients.”

 What you need to know about schizophrenia?

Schizophrenia is not split personality. Schizophrenia is a serious disorder which affects how a person thinks, feels and acts. Someone with schizophrenia may have difficulty distinguishing between what is real and what is imaginary; may be unresponsive or withdrawn; and may have difficulty expressing normal emotions in social situations.

The cause of schizophrenia is still unclear. Scientists recognize that the disorder tends to run in families as heredity factor and that a person inherits a tendency to develop the disease. It may also be triggered by environmental events, such as viral infections or highly stressful situations or a combination of both. People with schizophrenia have a chemical imbalance of brain chemicals -serotonin and dopamine which are neurotransmitters. These neurotransmitters allow nerve cells in the brain to send messages to each other. The imbalance of these chemicals affects the way a person’s brain reacts to stimuli such as loud music and bright lights which other people easily handle. This problem in processing different sounds, sights, smells and tastes can also lead to hallucinations or delusions.

Behavioral or early warning symptoms of Schizophrenia:

  • Hearing or seeing something that isn’t there
  • A constant feeling of being watched
  • Peculiar or nonsensical way of speaking or writing
  • Strange body positioning
  • Feeling indifferent to very important situations
  • Deterioration of academic or work performance
  • A change in personal hygiene and appearance
  • A change in personality
  • Increasing withdrawal from social situations
  • Irrational, angry or fearful response to loved ones
  • Inability to sleep or concentrate
  • Inappropriate or bizarre behavior
  • Extreme preoccupation with religion or the occult

 Symptoms of schizophrenia:

Positive symptoms are disturbances that are “added” to the person’s personality.

  1. Delusions – false ideas – individuals may believe that someone is spying on him or her, or that they are someone famous.
  2. Hallucinations – seeing, feeling, tasting, hearing or smelling something that doesn’t really exist. The most common experience is hearing imaginary voices that give commands or comments to the individual.
  3. Disordered thinking and speech – moving from one topic to another, in a nonsensical fashion. Individuals may make up their own words or sounds.

Negative symptoms are capabilities that are “lost” from the person’s personality.

1. Social withdrawal

2. Extreme apathy

3. Lack of drive or initiative

4. Emotional unresponsiveness

If you suspect someone you know is experiencing symptoms of schizophrenia, encourage them to see a medical or mental health professional immediately. Early treatment–even as early as the first episode–can mean a better long-term outcome. If left untreated schizophrenia can lead to chronic and then it will be too late to effect anything but the most minimal improvement.

References:

  1. http://www.mentalhealthamerica.net/conditions/schizophrenia
  2. https://www.sciencedaily.com/releases/2016/08/160812073654.htm
  3. http://www.mentalhealthamerica.net/
  4. Image: http://www.lifebuzz.com/cool-artwork/  

Author: Sumana Rao | Posted on: August 16, 2016
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