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Related Concept Videos

Learning Disabilities01:25

Learning Disabilities

Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
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Long-term Depression01:03

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Advancing Dyslexia Assessment in Children Through Computerized Testing
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Advancing Dyslexia Assessment in Children Through Computerized Testing

Published on: August 16, 2024

Dyslexia and the anchoring-deficit hypothesis.

Merav Ahissar1

  • 1Hebrew University, Mount Scopus, Jerusalem, Israel. msmerava@pluto.huji.ac.il

Trends in Cognitive Sciences
|November 7, 2007
PubMed
Summary

Dyslexia may stem from impaired perceptual dynamics affecting short-term memory. This deficit explains why dyslexic individuals don't benefit from repeated stimuli, unlike the general population.

Area of Science:

  • Cognitive Neuroscience
  • Developmental Psychology
  • Special Education

Background:

  • Dyslexia is often attributed to phonological deficits or issues with basic sensory processing.
  • Existing theories struggle to explain the wide range of difficulties experienced by individuals with dyslexia.

Purpose of the Study:

  • To investigate a unified perceptual dynamics deficit as the core issue in dyslexia.
  • To determine if impaired short-term memory efficiency underlies various dyslexic challenges.

Main Methods:

  • Experimental comparison of stimulus repetition effects between dyslexic and non-dyslexic individuals.
  • Analysis of perceptual tuning and anchoring to stimuli in both groups.

Main Results:

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  • The general population demonstrates faster and more accurate responses to repeated stimuli.
  • Individuals with dyslexia do not show the typical benefit from stimulus-specific repetitions.
  • This failure to benefit from repetition correlates with difficulties in short-term memory efficiency.

    • Conclusions:

    • A single impairment in perceptual dynamics, affecting short-term memory, may explain core dyslexia symptoms.
    • This deficit accounts for phonological, working memory, and sensory processing difficulties in dyslexia.
    • It also explains increased sensitivity to external noise in dyslexic individuals.