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Focusing of Light in the Eye01:16

Focusing 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...

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Related Experiment Video

Updated: Jun 25, 2026

A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets
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Proactive control: Endogenous cueing effects in a two-target attentional blink task.

S Montakhaby Nodeh1, E MacLellan1, B Milliken1

  • 1McMaster University, Canada.

Consciousness and Cognition
|February 3, 2024
PubMed
Summary

Pre-cues signaling attentional conflict improve performance in two-target tasks. This study shows that cues indicating task difficulty enhance attention, impacting both initial (T1) and subsequent (T2) target processing.

Keywords:
Attentional BlinkCognitive ControlEndogenous CueingProactive ControlSelective Attention

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Experimental Psychology

Background:

  • The attentional blink is a deficit in perceiving a second target (T2) when it follows a first target (T1) too closely.
  • Proactive control mechanisms are crucial for managing attentional resources during demanding tasks.
  • Endogenous cueing paradigms investigate how internal cues influence attention and target detection.

Purpose of the Study:

  • To investigate the role of proactive control in mitigating the attentional blink.
  • To examine how pre-cues signaling attentional conflict modulate performance in a two-target task.
  • To determine if cue informativeness affects processing of both T1 and T2.

Main Methods:

  • A two-target task where participants identified T1 and T2 presented in rapid succession.
  • Endogenous cueing was employed, with pre-cues indicating T1 selection difficulty.
  • Experiments varied cue presentation (mixed vs. blocked) and target stimulus onset asynchrony (SOA).

Main Results:

  • Informative pre-cues improved performance for both T1 and T2 compared to uninformative cues.
  • A cueing effect for T2 was observed in mixed cueing conditions.
  • In blocked conditions, cueing effects for both T1 and T2 were found, with T2 effects dependent on SOA.

Conclusions:

  • Pre-cues signaling attentional conflict can effectively modulate performance in dual-target tasks.
  • Proactive control, influenced by cue informativeness, plays a significant role in overcoming attentional limitations.
  • Findings contribute to understanding attentional mechanisms and the attentional blink phenomenon.