{"id":70645,"date":"2023-11-09T23:10:50","date_gmt":"2023-11-10T04:10:50","guid":{"rendered":"https:\/\/world.edu\/?p=70645"},"modified":"2023-11-10T03:52:43","modified_gmt":"2023-11-10T08:52:43","slug":"news-overload-how-a-constant-stream-of-violent-images-affects-your-brain","status":"publish","type":"post","link":"https:\/\/world.edu\/news-overload-how-a-constant-stream-of-violent-images-affects-your-brain\/","title":{"rendered":"\u2018News overload\u2019: how a constant stream of violent images affects your brain"},"content":{"rendered":"

\"\"
\nIn May 1097, during the siege of Nicaea, crusaders catapulted the severed heads of prisoners over the walls surrounding the city, with the aim of terrorising their enemy. The strategy worked. On June 19 of the year the crusaders captured the city.<\/p>\n

However, only those who lived near the city walls would have felt the utter horror of seeing human heads flung through the air: the inhabitants of nearby cities would not have received the news of these awful events until weeks or even months later. Even then, they would only have heard accounts of the events, without images or videos to reproduce exactly what happened. Eleventh century technology meant that weaponised mass terror had its limitations.<\/p>\n

Throughout human history, nations \u2013 as well as political, religious and military groups \u2013 have used terror to gain tactical or strategic advantages. Inhabitants of the 21st century are more sophisticated but ultimately no better than their historical counterparts.<\/p>\n

In today\u2019s world, omnipresent communication technology means the spread of horrific images is all but impossible to escape. We experience this now, for example, with images from Israel and Gaza, and other wars and attacks in recent years.<\/p>\n

Images that release cortisol<\/strong><\/h4>\n

Recently, research has been conducted into the psychological consequences of the phenomena known as\u00a0\u201cnews information overload\u201d<\/a>\u00a0and\u00a0\u201cgeneralised trauma event witnessing\u201d<\/a>.<\/p>\n

Even when viewed through a phone screen,\u00a0experiencing an extremely violent situation<\/a>\u00a0activates the sympathetic branch of our nervous systems, which governs our \u201cfight or flight\u201d response. Our bodies react to these images by secreting hormones into the bloodstream including adrenaline, noradrenaline and cortisol, commonly known as the stress hormone. These hormones quickly cross the blood-brain barrier and penetrate our central nervous systems.<\/p>\n

With these chemicals in our veins, our bodies change: heart rate and blood pressure increase to help us fight or flee the threatening stimulus and avoid injury or death. These are adaptive, short-term changes. If they become chronic,\u00a0they can cause serious health problems in the long run<\/a>, as has been common knowledge for decades.<\/p>\n

So what does this constant exposure to threatening stimulus do to our brains? Is there a risk that it might affect our reasoning?<\/p>\n

Poor memory and a loss of control<\/strong><\/h4>\n

We have known for only a few years that, in both humans and animals, continued stress produces\u00a0systemic changes in our brains<\/a>. In acutely stressful situations the hippocampus\u2019 role in memory becomes inhibited, and the prefrontal cortex ceases to exercise control. At the same time, our nervous systems prioritise habits and routines through a region called the\u00a0dorsal striatum<\/a>, which is regulated by the amygdala, also known as the brain\u2019s fear centre.<\/p>\n

These changes are, in principle, intended to help us cope with specific stressful situations in the short term. When we face a threat the priority is to react quickly, not taking time to remember similar events and analyse contextual factors. But if this goes on for a long time, it can have serious consequences for our cognition in the medium and long term.<\/p>\n

This is essentially because\u00a0chronic stress causes problems for our learning and memory<\/a>, affecting three areas which are worth exploring in more detail: precision, flexibility and reconsolidation.<\/p>\n

1. Precision.<\/strong>\u00a0The information that we process in stressful situations is more abstract and poorly contexualised. Attention is narrowed to focus only on the essential details of the stressful event.<\/p>\n

2. Flexibility<\/strong>\u00a0Stress practically eliminates our ability to integrate new information into existing frameworks. It also limits the way we can use these frameworks to appropriately process the stimuli that we are sensing. This makes it hard to transfer and apply previously acquired information to the immediate context. We might say that pressure and stress prevent us from making full use of experience.<\/p>\n

3. Reconsolidation<\/strong>\u00a0Our memories are usually not rigid, but rather they help us adapt to new conditions and learn about them. The process of updating and reestablishing our memories is known as \u201creconsolidation\u201d. Stress makes this process harder, and this in turn inhibits the reconstruction of memories that can help us to incorporate new information.<\/p>\n

When these systemic changes to our psychological processes occur among a large part of society\u00a0it can affect our ability to make rational political and social decisions, both among the population at large and among our leaders<\/a>.<\/p>\n

Author Bio:<\/strong> Francisco Javier Saavedra Mac\u00edas is Profesor Titular departamento de Psicolog\u00eda Experimental at the Universidad de Sevilla<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

In May 1097, during the siege of Nicaea, crusaders catapulted the severed heads of prisoners over the walls surrounding the city, with the aim of terrorising their enemy. The strategy worked. On June 19 of the year the crusaders captured the city. 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