Understanding Stress – Part 5: Tunnel Vision

Welcome to Part 5 of my discussion on stress. In the last segment I talked about the positive and negative impacts of hyper vigilance and its impact on first responder situational awareness.

While stress-released hormones increase arousal of the senses, the brain struggles to process all the information coming in. If you try to process the meaning of all the audible and visual inputs, you may find yourself on the fast-track overload.

In this segment, I’m going to discuss tunnel vision. When I was a new recruit, I vividly remember my training officer telling us ‘don’t get tunnel vision.’ He said it with such conviction that I knew it was important. So I wrote it down. But he never really told us what it was, how we get it and most importantly, how to avoid it. Let’s explore the concept of tunnel vision.

Tunneled vision

Early on in my journey into neuroscience I learned something about tunneled vision. It is a mislabeled term. While I have often heard the term used throughout my tenure in public safety – and having used it many times in my early years as an instructor, I never realized that the term tunnel vision does not accurately reflect what happens under stress. It’s a little more complex than I had realized.

 

 

Tunneled senses

Tunneled senses more accurately depicts the results of stress. All your senses can become tunneled when you are stressed. For vision, it means your visual attention can be focused on one small geographic area of an emergency scene or one task being performed at a scene and you miss seeing things in your periphery. For hearing, it means your audible attention can be focused on one source of sound, like a person talking to you face-to-face or traffic on your radio, or a siren of an approaching engine.

When you are suffering from tunneled senses your situational awareness is vulnerable because you are likely to miss important clues and cues. Many things happen in the peripheral vision that will be lost when vision is tunneled. When hearing is tunneled, you can miss hearing other things happening around you. The fixation on a single conversation or a single sound prevents you from hearing other things.

It gets worse

Researchers at Johns Hopkins University ran a series of audible and visual tests on human subjects, measuring the loss of acuity while engaging them in activities designed to narrow attention. The results were a shocker.

The experiment was designed to tunnel vision – and it did. But a completely unexpected event occurred. While the vision was being tunneled, the performance of the audible control center decreased. That was not a typo. Tunneled vision led to diminished hearing. Turns out, focusing on something intently led the audio cortex to turn down the volume.

When the researchers performed an experiment to tunnel the hearing, the performance of the visual control center decreased. Again, no typo. Tunneled hearing led to diminished vision.

This led the researchers to conclude that a person intently listening to audible cues, like a radio or cell phone, could have diminished visual performance. It also led the researchers to conclude a person intently focused on something visual could have diminished hearing.

Auditory exclusion

In some cases, when the stress is severe enough, the hearing receptors in the brain may shut off completely. Neuroscience has a term for that. It’s called auditory exclusion. Police officers often report that under stress of a gun fight they are unable to recall how many shots were fired because they did not hear them.

One of my teaching associates, Pete Schenck, is a firefighter, EMT and former police officer. He shares a story during my classes that drives this point home. One night, while sitting in his police car, Pete was ambushed by a deranged man with a shotgun. He man shot Pete’s police car multiple times, though Pete only remembers hearing one shot. The forensics evidence revealed the assailant had shot Pete’s car six times. Pete suffered from auditory exclusion, not to mention a whole host of other stress reactions he describes in vivid detail.

Chief Gasaway’s Advice

 

The first step in dealing with narrowing attention is to be aware that you are vulnerable to it happening as your stress level rises. Controlling your stress is one of the best ways to impact all of the ill-effects of the hormonal chemical dump that changes your psychological, cognitive, and physical performance. Breathing techniques are very effective for calming that little pea-sized organ in the brain that is the epicenter of your stress response. Control the pea and control the stress.

Scanning your environment may also help combat the effects of tunneled senses. Scanning visually and scanning audibly. If you find yourself becoming fixed on one task or one sound, make a conscious effort to unlock your senses from it and force yourself to scan your environment, perhaps asking yourself quizzically: What an I missing?

Discussion Questions

1. Is it possible that auditory exclusion could cause critical radio traffic, like a mayday, to be missed?

2. Discuss a time when you missed seeing or hearing something because of tunneled senses.

3. Were you ever taught about auditory exclusion during your recruit training? What about during your officer development or command training?

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The mission of Situational Awareness Matters is simple: Help first responders see the bad things coming… in time to change the outcome.

Safety begins with SA!

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Post your answers to the discussion questions or your comments to this article in the “Leave a Reply” box below.

If you want to send me incident pictures, videos or have an idea you’d like me to research and write about, contact me. I really enjoy getting feedback and supportive messages from fellow first responders. It gives me the energy to work harder for you.

Thanks,

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4 thoughts on “Understanding Stress – Part 5: Tunnel Vision

  1. Pingback: Stress: The Nemesis of Situational Awareness | Situational Awareness Matters!™

  2. Mr Kerry Penver

    I suffer from this, my symptoms are similar to central auditory processing disorder, I can hear but can’t comprehend the sentences. I can think but can’t string a sequence of words together to make a sentence, I can see a word and spell it out but can’t say it.

    The symptoms last minutes, and are triggered by phone calls or me concentrating on a thinking task for an extended time. I’ve had these symptoms for over 13 years now, and have suffered 3 Epileptic fits over the last 2 years, triggered by me feeling very relaxed at the time.

    My neurologist is only interested in my epilepsy.
    I’m a software business analyst so my job involves using a computer and thinking and writing most of the time. I also run workshops with customers, and when that happens I don’t usualy have any symptoms

    Kerry
    York England

    Reply
    • Rich Gasaway Post author

      Kerry,

      Thank you for sharing your story. If the condition impacts your quality of life and your neurologist is not interested in helping you with solutions, I would recommend seeing the help of another neurologist or a specialist in your disorder.

      Rich

      Reply

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