Body Language, And What It Does Not Do

Advice about posture and gesture is offered with considerable certainty. Some of it holds up well, and the strongest version of the claim has not survived scrutiny.

The reception effect is well established

Posture and gesture influence how others interpret a person. Someone upright and still is read differently from someone hunched and fidgeting, largely regardless of intent.

The interpretation happens quickly and mostly outside deliberate attention. It also affects subsequent judgements about competence, which is why it matters practically.

This part of the claim is uncontroversial and sufficient to justify paying some attention to how one stands and moves in consequential situations.

The internal effect is the contested part

The stronger claim is that adopting particular postures changes how a person feels and performs. This has proved much less reliable when examined carefully.

Reported feelings sometimes shift modestly. Measurable changes in behaviour and physiology have been considerably harder to demonstrate consistently.

Anyone told that a posture will transform their state before a difficult meeting is being offered the least supported version of the idea.

Attention may explain much of what people notice

Deliberately adjusting posture requires noticing your body and taking a moment to settle, which is itself calming for ordinary reasons.

Slower breathing usually accompanies the adjustment, and that has recognised effects on arousal. The posture may be a vehicle for the pause rather than the active element.

This makes the practice worth keeping while being honest about why it might work. A settling routine that happens to involve posture is a reasonable thing to have before a demanding conversation.

It also sets a sensible expectation. A brief pause produces a brief effect, which is useful at the margin and will not carry anyone through an event they are unprepared for.

Reading other people's posture is unreliable

Interpreting individual gestures as signs of specific mental states is popular and poorly supported. Crossed arms indicate cold as often as resistance.

Meaning depends on the person, the situation and their baseline. Confident interpretation of a stranger's gesture is usually confident guessing.

The safer use is to notice change relative to how someone usually behaves, and to treat it as a prompt to ask rather than a conclusion.

Forced adjustment can cost more than it returns

Monitoring your own posture during a demanding task consumes attention the task needs. The effect on performance can outweigh any gain in impression.

Adjustment before an event, rather than during it, avoids the conflict. Setting yourself before you begin leaves attention free for the substance.