Author Archives: dmats

Spiders: The more you fear them the bigger they appear.

Spider on a bathroom floor; image from flickr: MightyBoyBrian

 Eek! That creepy, crawly creature with eight legs that is inching towards you seems to be getting bigger and bigger. The next day when you recall your encounter with it, you describe it as “HUGE”. This fear that you feel when in the presence of a spider makes it actually appear larger in size than it really is. Having a phobia of something changes the  appearance of the object in a negative perspective to the person who is afraid of it.

Syringe; Image from flickr: hitthatswitch

For example, if the fear is not of spiders, perhaps it is of needles. These medical tools are associated with pain and therefore may appear larger to people who are more frightened of them. Personally, I am terrified of needles and this fear is detrimental to my health as I tend to avoid medical attention unless absolutely necessary. This is for fear of the possibility that I may get a needle. Phobia makes things more fearful and in return they appear larger in order to be more intimidating.

In order to prove this theory as factual, Michael Vasey, a professor of psychology at Ohio State University, ran a study that got published in the Journal of Anxiety Disorders. The target of the study was people who were suffering from a condition called arachnophobia. These people were extremely afraid of spiders and were observed over an eight week time period. The subjects were asked to approach a spider in a glass tank and were then asked to touch it with an 8-inch probe and then again with a shorter probe. After they had interacted with the spider, they were then asked to rate how much anxiety they felt on a scale from 1-100 and then were asked to draw how large they thought the spider had been in length from it’s tip to back end. 

Touching a spider; image from flickr: ŶΣŅΡǾΧ

Results

There were 57 people who participated in the experiment and it was found that there was a positive correlation; the more afraid a person was of the spider, the larger they thought it was in size. Vasey describes fear as a cycle, the bigger the spider appears, the more it is feeding into the phobia and the harder it will be to overcome in the future. This shows how our perception of an object is actually altered by the presence of fear. In order to treat phobias, psychologists have used exposure therapy where the effects are still not really understood to this day. This study also notices that a negative attitude is the factor which causes anxiety to heighten towards a “scary” object.

The purpose of this study is to eventually be able to treat these fears in the future. For now, scientists are working alongside psychologists to understand how fear can be controlled, and perhaps even diminished, for future phobic patients out there.

References:

Science Daily article:
http://www.sciencedaily.com/releases/2012/02/120222204241.htm

MedicineNet.com blog post:
http://www.medicinenet.com/script/main/art.asp?articlekey=155239

No more wires! Vital Signs monitored by Electronic Tattoos

The new patch that will revolutionise a patient's medical monitoring system. Image from John Rogers (University of Illinois)

The future looks bright for electronic monitoring, as temporary tattoos could revolutionise how the medical system keeps tabs on it’s patients.  The old, bulky devices that have been seen in hospitals, may now be replaced by the new, state-of-the-art temporary tattoo vital sign monitors.  Imagine the option of being monitored medically without the sticky gels and electrodes hooking you up to a machine; it sounds ideal to me! 

Electrodes; Image from Flickr: quinn.anya

Composition

John Rogers of the University of Illinois, termed this patch and it’s functions as “Epidermal Electronics.”    It takes the chemical components of larger electrodes (such as diodes, transmitters etc) that are found in the medical monitors of today, and builds them into wires only nanometers in size.  Rubber is then placed underneath this framework of wires which are placed on a water-soluble patch that resembles the structure of a rub-on tattoo and is only 40 micrometers in size (see Picture #1)!   The patch is flexible enough to expand and contract with the movement of the skin.  Application of the device is very similar to that of a rub-on tattoo, where it can be applied with a wet cloth and then a plastic shield is removed to reveal the vital-sign monitor.

 How it works
 
 How does this electronic device stick onto the skin of a person without falling off?  The chemistry of van der waals forces come into play, where the device touches the skin and they create an electric attraction between molecules.  This allows them to bend and form together with the two forces interacting to prevent the patch from falling off. 
If a patient is concerned with how the device appears, there is always the option of concealing it with a temporary tattoo that has a different design.  The video below from Youtube and NewScientist explains the monitor using a rub-on tattoo to hide the actual device: 

 YouTube Preview Image

Rogers and his team of researchers were able to determine that the chip was affective using a study of volunteers.  These people were able to place the minature monitor on their necks and any electrical changes from muscle movement throughout their body was sent through a computer that determined the participant’s vitals.

 What does this mean?

This device seems to be very beneficial for patients that need to be monitored for a few days in a clinical environment, however nowadays as our world is becoming more electronic we may be able to do this ourselves one day. The more options we will have for microscopic wireless devices in our everyday lives will rise. For example, iphones are currently creating applications to determine things like blood pressure, which is just a step in the direction of having vital signs monitored by our own cellphones!  The result could then be forwarded to a doctor electronically: no hassle, no fuss!

References:

NewScientist:
http://www.newscientist.com/article/dn20787-electronic-tattoos-to-monitor-vital-signs.html

Article in The New York Times:
http://www.nytimes.com/2011/09/04/technology/wireless-medical-monitoring-might-untether-patients.html

 John Rogers of the University of Illinois:
http://chemistry.illinois.edu/faculty/John_Rogers.html

 

A cure for the common…hangover?

        

Image from Flickr: silent(e)

Recent scientific investigations  have led to the findings of an ancient Chinese herb that is able to remove the painful effects that are known to follow the consumption of alcohol; a college student’s dream!  Yes, this chinese extract from the raisin tree Hovenia dulcis, has the sobering effects on a person after excessive drinking, can relieve the symptoms of a hangover and also may provide a lifetime cure for those suffering from alcoholism.   
 

Hovenia dulcis, Japanese Raisin Tree ; this tree may be the cure to problems involving alcohol. (Image on Flickr by Tie Guy II)

For years, many Chinese people have been  using this extract in their tea to reduce any uncomfort that is associated with a hangover. The compound from the ancient raisin tree that has been found as the source of the cure, is Dihydromyricetin (DHM). It has been recently studied  by Dr. Jing Liang of the University of California on lab rats (as mentioned in NewScientist).  The results included a quicker recovery from intoxication on the rats when they were given alcohol containing DHM (only 5 minute recovery time!), versus alcohol by itself (around  a 70 minute recovery time).  Liang also found through her research, that the addiction for rats that were constantly consuming alcohol began to decrease over time after given small doses of DHM weekly.  

 For the Future
The goal of this research, is ultimately to gain the ability to have it eventually be tested on humans.  Once this is achieved, the affects could be ground-breaking. As more alcoholics are “sobering-up”, they will more likely be able to keep a job and increase the economy.  It is also predicted that the safety of living may increase in regards to drunk driving.  With the help of this “new drug”, one could essentially have an evening of drinks and fun, and still be able to drive home after without being a drunken liability to themselves and others on the road.

But…
Ideally, all of the above outcomes would be true and the drug would be perfect.  However, humans as a race are unpredictable.  Personally, I do not agree that the drug will cure many people, and instead might cause people to drink more.  If there was no consequence of drinking (a hangover etc) then it would just be more appealing.  Other scientists like Marcus Heilig have also voiced their concern regarding the bad outcomes that may occur from use of the drug and whether or not it would be beneficial or harmful to the population. 

Image from Flickr by sfllaw

Dr Liang is on the path to something that could change the lives of many people.  With no side effects currently being seen on their studies thus far, let’s hope she gets approval to begin testing on humans in the near future.

 

 

References:

NewScientist article:
http://www.newscientist.com/article/dn21337-chinese-tree-extract-stops-rats-getting-drunk.html

Hovenia Duclis Journal:
https://www.thieme-connect.com/ejournals/pdf/plantamedica/doi/10.1055/s-0030-1249776.pdf

Link to Dr. Marcus Heilig:
http://www.niaaa.nih.gov/RESEARCHINFORMATION/INTRAMURALRESEARCH/ABOUTDICBR/LCTS/Pages/Chief.aspx

Dihydromyricetin blog:
http://alcoholreports.blogspot.com/2012/01/dihydromyricetin-as-novel-anti-alcohol.html