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Peripheral Artery Disease (PAD) is characterized by narrowed arteries that diminish blood flow to the extremities. Effective management of PAD requires an interprofessional approach involving various healthcare professionals. The critical aspects of interprofessional care for PAD patients focus on risk factor modification, drug therapy, exercise therapy, nutrition therapy, critical limb ischemia care, and interventional radiology and surgical procedures.The primary treatment goal for PAD...
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During the postoperative period, it is crucial to focus on maintaining circulation, identifying and managing potential complications, and planning for discharge.Nursing AssessmentVital signs monitoring: Regularly monitor vital signs, including blood pressure, heart rate, respiratory rate, and temperature, to detect early signs of complications such as bleeding and infection.Circulation assessment: Monitor pulses, perform Doppler assessments, and check capillary refill, color, temperature, and...
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The Peripheral Flicker Illusion.

Hiroyuki Ito1, Tomomi Koizumi2

  • 1Faculty of Design, Kyushu University, Fukuoka-shi, Japan; Research Center for Applied Perceptual Science, Kyushu University, Fukuoka-shi, Japan.

I-Perception
|January 19, 2018
PubMed
Summary
This summary is machine-generated.

A new visual illusion causes flicker or double flashes when colored objects appear on a red background. This illusion is stronger with peripheral vision and specific luminance contrasts.

Keywords:
colorillusionperipheral visionrod-cone interaction

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Area of Science:

  • Visual perception
  • Psychophysics
  • Ophthalmology

Background:

  • Visual perception research explores how the brain interprets visual stimuli.
  • Illusory phenomena offer insights into the mechanisms of visual processing.
  • Previous studies have not documented this specific flicker illusion.

Purpose of the Study:

  • To report and characterize a novel visual illusion involving apparent flicker or double flashes.
  • To investigate the conditions under which this illusion occurs, including object/background color, retinal eccentricity, and luminance.
  • To propose a theoretical explanation for the observed illusion.

Main Methods:

  • Experiment 1: Presented objects of varying colors (red, green, blue) on different backgrounds (red, green, blue, gray) and assessed illusion strength against physical flicker.
  • Experiment 2: Examined the influence of retinal eccentricity on the illusion's intensity.
  • Experiment 3: Determined optimal luminance conditions (object vs. background) for the illusion with green and blue objects.

Main Results:

  • The illusion was consistently elicited by green or blue objects on a red background.
  • Illusion strength increased with retinal eccentricity, being weakest in central vision.
  • The illusion was strongest when object luminance was lower than background luminance; optimal luminance differed for blue and green objects.

Conclusions:

  • A new visual illusion, characterized by perceived flicker or double flashes, has been identified.
  • The illusion is dependent on specific color pairings (green/blue on red), viewing conditions (peripheral vision), and luminance contrasts.
  • A tentative theory is proposed to explain the underlying mechanisms of this novel visual phenomenon.