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Related Concept Videos

Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Reaction Mechanisms: Rate-limiting Step Approximation01:29

Reaction Mechanisms: Rate-limiting Step Approximation

The rate-determining step, or RDS, in a chemical reaction is the slowest step that determines the overall reaction rate. It is identified by using the observed rate law and typically involves approximation methods like the RDS approximation or the steady-state approximation.In the RDS approximation, also known as the rate-limiting-step or equilibrium approximation, the reaction mechanism consists of one or more reversible reactions near equilibrium, followed by a slower RDS, and then one or...
Consecutive Reactions01:22

Consecutive Reactions

Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...
Multi-Step Reactions02:31

Multi-Step Reactions

Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
Transition State Theory01:25

Transition State Theory

Transition-state theory, also known as activated-complex theory, provides a molecular-level explanation of reaction rates in both gas-phase and solution-phase reactions. It extends earlier kinetic models by considering the formation of a short-lived, high-energy configuration during a reaction.The progress of a chemical reaction can be represented using a reaction profile, which plots potential energy against the reaction coordinate. As two reactant molecules approach one another, their...
Rate-Determining Steps03:08

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...

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Related Experiment Video

Updated: May 20, 2026

Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
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Published on: August 29, 2018

Can post-error dynamics explain sequential reaction time patterns?

Stephanie Goldfarb1, Kongfatt Wong-Lin, Michael Schwemmer

  • 1Princeton Neuroscience Institute, Princeton University NJ, USA.

Frontiers in Psychology
|July 20, 2012
PubMed
Summary
This summary is machine-generated.

Human error dynamics in choice tasks show sequential effects on reaction times (RTs). Faster RTs on errors correlate with slower RTs on correct responses, suggesting error-based adjustments are key.

Keywords:
drift diffusion modelerror rateperceptual decision makingpost-error slowingreaction timesequential effects

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Area of Science:

  • Cognitive Psychology
  • Human-Computer Interaction
  • Neuroscience

Background:

  • Human performance in sequential tasks exhibits systematic dependencies on preceding stimuli.
  • Reaction times (RTs) and error rates are influenced by trial history.

Purpose of the Study:

  • To investigate human error dynamics in sequential two-alternative choice tasks.
  • To analyze sequential effects on RTs, differentiating between error and correct responses.
  • To identify and model the sequential RT tradeoff.

Main Methods:

  • Analysis of RTs and error rates across sequences of stimuli.
  • Utilizing data from choice tasks with first-order Markov process stimulus generation.
  • Reanalysis of prior data and acquisition of new experimental data.
  • Application of a pure drift diffusion model with sequential updates.

Main Results:

  • A sequential RT tradeoff was identified: fast RTs on error trials correspond to slow RTs on correct trials.
  • Stimulus sequence properties, particularly alternation probability, significantly influence RTs.
  • Existing models failed to capture these observed relationships.
  • Sequential updates to drift diffusion model parameters accounted for RT trends.

Conclusions:

  • Error-based parameter adjustments are crucial for accurately modeling sequential effects in human performance.
  • Understanding human error dynamics provides insights into cognitive processes.
  • The identified RT tradeoff offers a novel perspective on decision-making under sequential constraints.