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The serial position effect is a cognitive phenomenon where individuals are more likely to recall the first and last items in a list compared to those in the middle. This effect is divided into the primacy effect and the recency effect. The primacy effect is observed when the initial items in a list are remembered better. This occurs because these items are rehearsed more frequently or receive more elaborative processing, allowing them to be encoded into long-term memory more effectively. For...
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The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
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The sign test is an important tool in nonparametric statistics, offering a straightforward yet effective method for analyzing matched pairs, nominal data, or hypotheses concerning the median of a population. It transforms data points into positive or negative signs, avoiding the need for assumptions about data distribution and instead focusing on the direction of change. It is particularly valuable when data does not conform to the normal distribution requirements of many parametric tests. For...
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The sign test is a nonparametric method used to evaluate hypotheses about the median of a single sample or to compare the medians of two related samples. The sign test is particularly useful when dealing with nominal data, which includes distinct categories without an inherent order, such as names, labels, and preferences. Nominal data restricts statistical analysis to evaluating population proportions rather than mean or median values that require continuous data.
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A Within-Subject Experimental Design using an Object Location Task in Rats
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Serial position encoding of signs.

Michele Miozzo1, Anna Petrova2, Simon Fischer-Baum3

  • 1The New School, United States; Johns Hopkins University, United States.

Cognition
|June 1, 2016
PubMed
Summary
This summary is machine-generated.

Short-term memory (STM) for sign language shows reduced capacity due to difficulties binding visual information to its position, not encoding type. The "both-edges" positional encoding scheme appears specific to sign language STM.

Keywords:
DeafnessShort-term memorySign language

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Area of Science:

  • Cognitive Psychology
  • Linguistics
  • Neuroscience

Background:

  • Short-term memory (STM) capacity is typically reduced for sign language compared to spoken language when ordered recall is required.
  • This deficit is often attributed to less efficient serial position encoding in visuo-spatial STM (for sign) versus verbal STM (for speech).

Purpose of the Study:

  • To investigate whether the reduced STM capacity for sign language is due to a lack of positional encoding found in verbal STM.
  • To determine if the "both-edges" positional encoding scheme, identified in verbal STM, is also present in the visuo-spatial STM for sign language.

Main Methods:

  • Analysis of errors made by deaf participants recalling finger-spelled letters.
  • Comparison of positional encoding schemes between verbal STM and visuo-spatial STM for sign language.

Main Results:

  • The "both-edges" positional encoding scheme was identified in the short-term memory representation of signs used by deaf participants.
  • This suggests that the type of positional encoding is not the cause of the STM disadvantage for sign language.

Conclusions:

  • The STM disadvantage for sign language stems from challenges in binding visuo-spatial items to their specific sequence positions.
  • The "both-edges" positional encoding scheme may be unique to sign language STM and not found in visuo-spatial STM tasks with hearing individuals.