How stress can affect decision-making during a violent encounter

A new article published by Firearms examines how acute stress can affect a person’s perception, decision-making and memory during a violent encounter. Written by Moira Kloppers, the article argues that firearm owners should prepare not only for the physical demands of self-defence, but also for the way the human body responds to extreme danger.

When a person suddenly faces a serious threat, the sympathetic nervous system activates the response commonly described as fight, flight or freeze. Stress hormones such as adrenaline are released, the heart rate rises, breathing accelerates and blood is redirected towards major muscle groups. These reactions are normal survival mechanisms, but they can also interfere with how a person processes information.

Kloppers highlights tunnel vision as one possible consequence of acute stress. A person may focus so intensely on the immediate threat that they fail to notice a second attacker, a bystander, an escape route or another important factor. The article describes this narrowing of attention as a physiological response rather than automatically a sign of poor judgement.

Stress can also affect hearing. People involved in violent incidents have reported auditory exclusion, in which the brain filters out sounds such as gunshots, sirens or shouting. Although those sounds may be obvious to observers, the brain may prioritise information it considers most relevant to immediate survival.

The perception of time may change as well. Some people describe a high-stress event as unfolding in slow motion, while others have difficulty judging how quickly events occurred. The article notes that time itself has not changed; rather, the brain is processing information differently under pressure.

Memory can be affected after the incident. A person may struggle to recall particular details, remember events in the wrong sequence or experience gaps in their recollection. Kloppers notes that inconsistent accounts do not necessarily indicate dishonesty, as the brain may still be processing the traumatic event. Statements made immediately afterwards may also differ from later accounts as memories consolidate.

The article presents training as an important part of preparation because correctly practised skills require less conscious thought when stress levels rise. It stresses that training is about more than marksmanship, with repetition intended to build familiarity and automatic responses. The article refers to the emphasis placed on repetition in professional military, law-enforcement and defensive training programmes.

For South African firearm owners, the article also points to the consequences that may follow a defensive incident. The threat may end, but police investigations, witness statements, legal processes and emotional effects can begin immediately afterwards. Firearms’ central message is that responsible preparation includes understanding personal reactions to stress, as well as the equipment and skills involved in armed self-defence.