The researchers showed participants a series of photographs. Some photos contain images that are very unpleasant, some of which are neutral. Participants who sleep not long after seeing the photos are more likely to judge it as a disturbing picture when I saw him again.
In contrast to the results of previous studies, sleep is considered as a useful activity and is able to reduce the negative emotions of bad memories. This study has profound implications for preventing stress disorder due to trauma or post traumatic stress disorder (PTSD).
From a clinical standpoint, sleep disturbances or insomnia after trauma is not necessarily bad. It may be that this is an appropriate biological responses and may help to forget the traumatic event.
Previous studies have shown that sleep helps keep long-term memories. Some researchers have asserted that a blind eye is also able to regulate emotional responses associated with the event. A study in 2009 showed that the negative emotion of the memory is reduced after sleep.
The scientists assume that the brain strengthens memories as well as binding of emotional response to these memories. The actual relationship between the two phenomena are still not studied until now.
106 volunteers aged 18 to 30 years. They were shown 30 photographs neutral and 30 negative images. One of the most negative image is a horrible scene of the war-torn country. One neutral photograph is a photograph of a man reading a newspaper.
After seeing all the photos, participants were asked to rank how happy and how tergugahkah feelings on a scale of 1 to 9. Twelve hours later, the researchers mix the 120 new photos to the photo that has been used previously, and asked participants to rank the photos. This time, researchers also asked participants whether participants remember the previous photographs.
To examine how sleep can affect memory and emotional responses, the researchers divided 82 volunteers into two groups. In the sleep group, the first session were asked to rate negative pictures and neutral pictures at night, and the second session conducted on the morning after waking. The group gets up in the morning's first session and second session in the evening, but was not allowed to consume alcohol or take a nap during the day.
Sleep groups are connected to the device that records how much time is spent when sleeping. To reduce the possibility that time can also affect memory, the researchers divided 24 people are left in the morning and evening groups are separated by two sessions for 45 minutes.
Spencer and his team found that sleep quality of participants in the memory of negative pictures and neutral pictures. In addition, people sleeping in the group felt that both sessions are equally disturbing, while the group woke up to find that photo on the second session is not too distracting.
Sleep protect the emotional reaction, which means to help seal the negative emotional responses. Investigators also learned that the amount of REM sleep, stages of sleep are often associated with dreaming does not affect how well participants remember the photo, but it affects the emotional reaction to the photo. Participants who sleep most its high quality REM assess more disturbing picture when I saw him for the second time.
The researchers believe that sleep helps to protect a person from the emotional response that is rooted in evolution. If someone or something to attack, people want to remember the emotion that is felt so that it can avoid it.
This study shows that sleep strengthens memory, even for memories that are not emotional. This reinforces the idea that sleep is generally favorable.
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