Attention Network Task (ANT)
The Attention Network Task (ANT) is a single paradigm designed to measure the efficiency of three separable attentional networks: alerting (achieving and maintaining a state of vigilance), orienting (selecting a location in space), and executive control (resolving conflict between competing responses). By combining a cueing manipulation with a flanker manipulation, the ANT estimates each network's contribution within one trial type.
The ANT Procedure
On each trial the participant sees a row of five arrows centered above or below a fixation point, and must indicate the direction of the central target arrow (left or right) as quickly and accurately as possible. Two manipulations are crossed:
- A cue before the target varies in type:
- No cue — no warning.
- Center cue — a marker at fixation (alerting only).
- Spatial cue — a marker at the target location (alerting + orienting).
- Double cue — markers above and below fixation (alerting only, no location information).
- Flanker congruence of the surrounding arrows:
- Congruent — flankers point the same way as the target.
- Incongruent — flankers point the opposite way (conflict).
- Neutral — flankers are non-directional (e.g., dashes).
What the ANT Measures
Three network scores are computed as differences in reaction time:
- Alerting effect = RT(no cue) − RT(double cue). The benefit of a general warning.
- Orienting effect = RT(center cue) − RT(spatial cue). The benefit of knowing where the target will appear.
- Executive control (conflict) effect = RT(incongruent) − RT(congruent). The cost of resolving interference, analogous to the Stroop Effect and the Eriksen Flanker Task.
Because the manipulations are factorially combined, the three scores are estimated independently within a compact design — a major reason the ANT is so widely used.
Variations
The ANT has been adapted for children (ANT for children, with cartoon stimuli), for emotional cues (affective ANT, using emotional faces as targets), and for fMRI, where each network localizes to distinct brain regions (thalamus/intraparietal for orienting, frontal for executive control).
Why It Matters
The ANT provides a standardized, theory-driven profile of attention. It is used to study individual differences, aging, clinical populations (ADHD, anxiety, autism), and the effects of training or drugs on specific attentional systems rather than "attention" as a monolith.
Methodology
Methodology: This topic is part of the experimental workflow covered in Experimentology. For the relevant methods, see Design (factorial combination of cue and congruence as independent variables), Measurement (computing network scores as RT differences and their reliability), and Inference (interpreting factorial effects). The cueing logic builds on the Posner Cueing Task.
Related Topics
- Posner Cueing Task - The orienting/alerting cueing logic
- Eriksen Flanker Task - The conflict manipulation
- Stroop Effect - Another interference effect
- Spatial Attention - Selection in space
- Endogenous vs Exogenous Cueing - Voluntary versus involuntary orienting
Implementation
A jsPsych implementation of the Attention Network Task is part of the ExpFactory experiments collection, which provides browser-ready code combining cueing and flanker logic.
Try It Yourself
References
- Fan, J., McCandliss, B. D., Sommer, T., Raz, A., & Posner, M. I. (2002). Testing the efficiency and independence of attentional networks. Journal of Cognitive Neuroscience, 14(3), 340-347.