Related Experiment Video
Updated: Jul 9, 2026
08:45
A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets
Published on: December 5, 2014
The blinking spotlight of attention
Rufin VanRullen1, Thomas Carlson, Patrick Cavanagh
1Centre de Recherche Cerveau et Cognition, Université Paul Sabatier, Université de Toulouse, 31062 Toulouse Cedex 9, France.
Summary
Human attention may process multiple targets by rapidly sampling them, not continuously. This periodic attention strategy, around seven items per second, appears fundamental even for single targets.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Attention
Background:
- Current research indicates attention can select multiple locations simultaneously.
- Debate exists on whether this involves continuous parallel processing or rapid periodic sampling.
- Distinguishing between these attention strategies is crucial for understanding cognitive mechanisms.
Purpose of the Study:
- To develop a method differentiating between parallel and sampling attention strategies.
- To investigate the underlying mechanism of multi-target attention in humans.
- To determine if attention operates in a continuous or discrete temporal regime.
Main Methods:
- Utilized human psychometric functions for single-target detection.
- Predicted psychometric functions for multiple targets based on parallel vs. sampling models.
- Compared model predictions with empirical performance data in a detection task.
Main Results:
- Human performance data aligned best with a periodic sampling model.
- Evidence suggests attention processes multiple items serially at ~7 Hz.
- Periodic attention mechanisms were observed even when attending to a single target.
Conclusions:
- Human attention likely employs a periodic sampling strategy for multiple targets.
- Attention may inherently operate via an intrinsically periodic process.
- This finding challenges continuous attention models and supports discrete temporal sampling.
Related Concept Videos
01:16Focusing of Light in the Eye
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
01:11Blinding
Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
02:09Bystander Effect
The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.
01:25Self-Presentation
Self-presentation is a fundamental aspect of social interaction, shaping both how others perceive individuals and how they view themselves. This dynamic process influences behaviors in various social settings, often leading people to adjust their appearance, speech, and demeanor to align with their desired identity. While self-presentation can be deliberate or unconscious, it plays a critical role in interpersonal relationships and self-perception.Forms of Self-PresentationSelf-presentation can...
01:30Attention-Deficit/Hyperactivity Disorder
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.
01:20Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...