Tag Archive for Brain Light

fMRI In Lie Detection

by  • March 6, 2013 • 1 Comment

Machines That Detect Lies – When All Else Fails Bring In The Machines

fMRI is the abbreviation for functional magnetic resonance imaging which enables researchers to create maps of the brain’s networks as it processes thoughts, sensations, memories, and motor commands. As our brains work, it requires blood to operate and the greater the work done, the more blood is required. What gives lies away is that certain areas of the brain “light” up through increased blood flow when lying take place. The job of the fMRI machine is to read this flow and decipher patterns. Regions of the brain that are used in lying include the anterior (front) cingulated which functions in process goals and intensions, the right orbital interior frontal which processes reward, and the right middle frontal that helps govern tasks that require more than just ordinary thought. It is these three brain centers working in concert that produce and also mask lies.

The fMRI measures blood flow and hence measures which areas of the brain are using up oxygen faster and are working harder. Proponents of fMRI machines in lie detection claim that if you can get hits in all three zones of the brain at the same time you can catch liars. In some studies lying has been detected in upwards of ninety-three percent success rate with the help of fMRI machines. However, the current methodologies of the study present some very big hurdlers before the machines can use the technology in lie detection. For example, small movements in the head or speaking aloud can disrupt the scan and produce unreadable information. The test also requires baseline procedures that compare deceptive thought patterns and honest thought patterns, both of which can be made troublesome by an uncooperative participant. The units are also expensive, bulky and require immersion into the unit which proves to be impractical under most circumstances.

A second more portable device is in creation that uses processes similar to fMRI except that it uses near-infrared light that pass through the forehead and skull but penetrates only the first few centimeters of cortical tissue. This also uses blood flow similar to the fMRI. Once it passes through it is captured by optical sensors and filtered. The unit is formed with a headband studded with LEDs and silicon diode sensors. Researchers were able to detect lying in a card game ninety-five percent of the time using these machines.

While blood flow to certain parts of the brain can be excellent predictors of lying, it does no help for us as human lie detectors since there are no direct body language cues as yet discovered that are tied directly to brain activity.

The Mirror Neuron

by  • March 5, 2013 • 0 Comments

When people "jive," they are in agreement and this commonality leads to liking.

When people “jive,” they are in agreement, and this commonality leads to liking. In this photo we see a couple mirroring each other by drinking in unison.

The discovery of the mirror neuron happened by accident at the University of Parma in Italy by researchers Giacomo Rizzolatti and Vittorio Gallese. They were studying the planning and movement activity in monkey brains and found that a specific set of neurons responded when monkeys grasped a peanut while other neurons altogether fired when they ate the peanut. When one of the researchers reached for a peanut to give to the monkey, they observed the monkey’s brain react as if it where the monkey who was reaching for it. They found that the same regions of the monkey’s brain activated whether the action was performed by the monkey or if the action was simply observed by the monkey. The mirror neuron was an important discovery, but one that happened completely by chance.

In follow up studies, the mirror neuron has been directly observed in other primates and even birds. Researchers conclude that it very likely exists in the minds of humans as well. However, the mirror neurons in the human brain are much more difficult to study because isolating single neurons is impossible. In animals, the neuron fires when an animal acts and also when they view another animal act. Studies show us that the neuron therefore fires as if the motion was actually performed, when in reality the movement was merely observed. Similarly, brain scans of human’s show that areas of the brain light up when they view others performing actions. These are the same areas that would light up had the action been performed. Today, it is generally agreed that there is no such single neuron at work, but rather a network of neurons working together making the “mirror neuron” a bit of a misnomer.

The origins of the “mirror neuron” might stem from imitative learning. By observing people performing actions we could pick up skills instead of having to learn the actions all on our own. In other words, mirroring allowed us to learn vicariously which is a much quicker way to learn and also less dangerous. Just imagine having to learn to use a sharp knife or chainsaw having never seen one used, nor what either is capable of doing, either to a tomato or tree trunk. Another possible reason for these class of neurons might be related to empathy and emotion since the neurons might help us connect with others. For example, when we view pictures of people who display happiness, disgust, fear or pain, we react to them as if we had felt it ourselves. This ability to connect with people, even strangers, has an important function in our daily lives since it allows us to build and hold relationships, creates sympathy, and inhibit fighting.

Above: The mirror neuron Part I

Above: The mirror neuron Part II