What is the Relationship between Attention and Eye Movements?

Core Concepts

Overt versus covert attention

• Overt attention is attention accompanied by a head or eye movement: you look at the cookie jar, and your gaze lands on it. This is the default mode for most real-world orienting.
• Covert attention is attention without any movement: you keep your eyes on your book but attend to the person walking past in your peripheral vision. Covert attention was demonstrated with the Posner cueing task, in which a cue (an arrow or brief flash) indicates where a target is likely to appear. Participants detect targets faster and more accurately at the cued location even while keeping their eyes fixed on a central point — proving that selection of space happens without moving the eyes.

Covert attention shows attention is not merely "where the eyes are"; yet the two are so often aligned that researchers long suspected a common mechanism.

The premotor theory of attention

The premotor theory of attention (Rizzolatti and colleagues) makes a strong claim: covert attention shifts are nothing but oculomotor programs — saccade plans — that are prepared but not executed. On this view, the "spotlight of attention" is the same machinery that plans eye movements, and attention is essentially motor preparation. Three lines of evidence support it:

• Anatomy: the key oculomotor structures — the frontal eye fields (FEF), the lateral intraparietal area (LIP)/parietal eye fields, and the superior colliculus (SC) — also modulate visual attention when no movement is made.
• Physiology: neurons in these areas encode both the target of a planned saccade and the locus of attention; microstimulation of the SC or FEF can shift attention even when too weak to move the eye.
• Behavior: attention moves to a saccade target just before the eyes arrive, and you cannot easily attend to one location while planning a saccade to another.

The theory remains influential but debated: some evidence shows attention and saccade planning can be partially dissociated. Treat the premotor theory as a strong unifying hypothesis with the "shared machinery" claim well supported and the "identical process" claim still contested.

The shared oculomotor-attentional network

The structures that plan eye movements are the same ones that direct attention:

• Superior colliculus (SC): a midbrain structure with a topographic map of visual space. Its superficial layers respond to visual stimuli; its deeper layers command saccades. Weak electrical stimulation of the deep layers shifts attention without moving the eye, while stronger stimulation triggers the saccade — exactly the graded relationship the premotor theory predicts.
• Frontal eye fields (FEF): a frontal cortical area that plans voluntary saccades. Single neurons fire for a saccade target and also for a covertly attended location; inactivating or stimulating the FEF changes both eye movements and attention.
• Parietal eye fields / lateral intraparietal area (LIP): parietal neurons build a priority map — a spatial representation combining bottom-up salience (a bright flash) with top-down goals (where you intend to look). LIP activity predicts both saccade choices and attentional capture.

This shared network is why parietal damage causes attention problems and eye-movement problems together.

Saccades, fixations, and the timing of attention

Eye movements come in several types:

• Saccades: rapid, ballistic jumps that bring a new part of the scene onto the fovea. A saccade takes only tens of milliseconds, and vision is largely suppressed during the movement (saccadic suppression) so the world does not appear to blur or jump.
• Fixations: brief periods (commonly ~200–300 ms during reading and scene viewing) when the eye is relatively still and detailed information is acquired. Attention typically shifts to the next fixation target before the saccade begins — commonly reported as roughly 100 ms or more of advance — so processing is already biased toward that location when the eye lands.
• Smooth pursuit: slower tracking movements that keep a moving target (a bird, a car) on the fovea, engaging attention continuously.

Corollary discharge (efference copy) — a copy of the motor command sent to sensory areas — is how the brain keeps the world stable across saccades: it predicts the retinal shift caused by the movement and compensates for it. Damage to the pathway carrying this signal (via the mediodorsal thalamus to the FEF) impairs updating spatial maps across saccades.

Inhibition of return

After attention is drawn to a location and then withdrawn — especially by a sudden peripheral cue — orienting back to that location is briefly slower. This inhibition of return (IOR) is commonly reported to appear roughly 200–300 ms after the cue and favors novelty: it encourages attention and the eyes to keep moving to new places rather than returning to just-visited ones. IOR is measured in cueing tasks and is often interpreted as an oculomotor effect (it interacts with saccade preparation), again tying attention to the eye-movement system. It is a robust, widely replicated phenomenon; exact timing and applicability depend on task parameters.

Reading and scanning: attention drives the scanpath

Reading is a live demonstration of the coupling: the eyes make a series of saccades (commonly ~7–9 characters, with regressions back to earlier text), and attention is tightly yoked to the fixation point — you generally cannot read a word you are not fixating. Scene viewing follows a scanpath in which fixations cluster on informative regions (faces, text, moving objects). Eye tracking of scanpaths is used in usability testing and clinical assessment precisely because the eyes reveal attention's trajectory. Attention and eye position can diverge briefly (covert attention to the periphery while fixating), but in skilled tasks like reading they are tightly aligned.

Common Confusions