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Related Concept Videos

Sampling Plans01:23

Sampling Plans

Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Sample Size Calculation01:19

Sample Size Calculation

Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, observations, or groups (in some cases) used to get the data to estimate a population parameter. As the name suggests, the sample size is that of the sample drawn from the population and differs from the population size.
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...
Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
Sample Handling01:02

Sample Handling

Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
Sampling Methods: Overview01:06

Sampling Methods: Overview

A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of sampling...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

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Pitch enumeration: failure to subitize in audition.

Neil M McLachlan1, David J T Marco, Sarah J Wilson

  • 1School of Psychological Sciences, The University of Melbourne, Melbourne, Australia. mcln@unimelb.edu.au

Plos One
|April 10, 2012
PubMed
Summary

Auditory pitch enumeration is limited, with people often underestimating the number of pitches heard. This occurs because the brain groups harmonically related tones, hindering accurate pitch counting.

Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Cognitive Neuroscience

Background:

  • Subitizing allows effortless enumeration of up to four visual objects.
  • However, auditory pitch enumeration is limited, with only one pitch reliably enumerated.
  • This limitation may stem from grouping tones by harmonic relationships before fine pitch processing.

Purpose of the Study:

  • To investigate pitch enumeration accuracy for harmonic complex tones.
  • To determine if grouping errors influence pitch enumeration.
  • To compare pitch enumeration with visual subitizing.

Main Methods:

  • Participants enumerated pitches in chords of varying harmonic complexity.
  • Low familiarity chords were used to prevent recognition and recall.

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  • Accuracy was compared to visual enumeration performance.

    • Main Results:

    • Pitch enumeration accuracy was lower than in the visual system.
    • Underestimation of pitch number increased with fewer harmonics.
    • Stimuli with fewer harmonics led to greater grouping errors.

    Conclusions:

    • Harmonically related tones are grouped early in auditory processing.
    • The auditory nerve's frequency resolution limits accurate pitch enumeration.
    • This grouping mechanism explains the difficulty in enumerating multiple pitches.