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Related Concept Videos

Working Memory01:24

Working Memory

Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this information.
Information Processing Approach01:30

Information Processing Approach

The information-processing theory of cognitive development centers on fundamental mental processes, including attention, memory, and problem-solving skills. Researchers in this field examine how cognitive abilities, such as working memory, evolve and influence children's overall development. Studies indicate that children with stronger working memory tend to excel in reading comprehension, math, and problem-solving compared to peers with less efficient memory skills. Low working memory is also...
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Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...
Experimental Designs01:16

Experimental Designs

An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
Stimulants01:29

Stimulants

Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
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CNS Stimulants: Cocaine, Amphetamines and Cannabinoids

CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its effects by...

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Related Experiment Video

Updated: May 18, 2026

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
10:38

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions

Published on: July 16, 2015

Caffeine, extraversion and working memory.

Andrew P Smith1

  • 1Centre for Occupational and Health Psychology, School of Psychology, Cardiff University, UK

Journal of Psychopharmacology (Oxford, England)
|September 28, 2012
PubMed
Summary
This summary is machine-generated.

Caffeine benefits extraverts more on certain working memory tasks, but not all cognitive functions. This study explored low-dose caffeine effects on working memory, psychomotor speed, and information encoding in relation to personality.

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Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment
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Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment

Published on: September 20, 2020

Related Experiment Videos

Last Updated: May 18, 2026

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
10:38

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions

Published on: July 16, 2015

Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment
07:01

Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment

Published on: September 20, 2020

Area of Science:

  • Cognitive Neuroscience
  • Psychopharmacology

Background:

  • Previous research indicates extraverts benefit more from caffeine on working memory tasks.
  • Understanding these interactions is crucial for cognitive enhancement research.

Purpose of the Study:

  • To replicate and extend findings on caffeine-extraversion interactions using a lower caffeine dose (65 mg).
  • To investigate effects across various working memory components, psychomotor speed, and information encoding.
  • To determine if caffeine-extraversion interactions are specific to working memory.

Main Methods:

  • A double-blind, placebo-controlled study with 128 participants.
  • Random assignment to either caffeinated or decaffeinated coffee conditions.
  • Inclusion of diverse cognitive tasks: working memory, psychomotor speed, and information encoding.

Main Results:

  • Caffeine-extraversion interaction was observed for serial recall and running memory tasks.
  • Caffeine improved simple reaction time and information encoding speed.
  • These improvements in reaction time and encoding were independent of extraversion levels.

Conclusions:

  • Caffeine's cognitive effects, particularly on working memory, are modulated by personality traits like extraversion.
  • Caffeine enhances basic cognitive functions such as reaction time and encoding speed universally.
  • Findings suggest specific biological mechanisms underlying caffeine's differential impact on cognition based on personality.