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Related Concept Videos

Overview of Microscopy Techniques01:22

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Related Experiment Video

Updated: May 6, 2026

In Vivo Calcium Imaging of Neuronal Ensembles in Networks of Primary Sensory Neurons in Intact Dorsal Root Ganglia
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Sensory stores and high-speed scanning.

M Aubé1, B Murdock

  • 1Department of Psychology, University of Toronto, M5S 1A1, Toronto, Ontario, Canada.

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This summary is machine-generated.

This study found no evidence that the sensory store

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Area of Science:

  • Cognitive Psychology
  • Human Information Processing
  • Experimental Psychology

Background:

  • Theories of memory propose distinct sensory and short-term stores.
  • Scanning models describe how information is retrieved from these stores.
  • Previous models suggested a serial exhaustive scanning process.

Purpose of the Study:

  • To test a scanning model based on separate sensory and short-term stores.
  • To investigate the role of sensory store size in information processing.
  • To evaluate serial exhaustive versus parallel processing models.

Main Methods:

  • Probe recognition task with varying set sizes (1-8 items).
  • Fast stimulus presentation rate.
  • Masking procedure to manipulate sensory store capacity.

Main Results:

  • Sensory store size did not significantly affect reaction time.
  • Data provided limited support for serial exhaustive scanning.
  • A parallel processing model demonstrated a better fit to the data.
  • A crossover effect was observed between positive and negative probe functions.

Conclusions:

  • The findings challenge models relying on a significant sensory store effect.
  • Parallel processing appears more plausible for high-speed scanning tasks.
  • The crossover effect suggests complex interactions between accuracy and latency in rapid cognitive processes.