Related Experiment Video
Updated: May 29, 2026
07:33
Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice
Published on: June 29, 2018
Endogenous modulation of low frequency oscillations by temporal expectations.
Andre M Cravo1, Gustavo Rohenkohl, Valentin Wyart
1Department of Physiology and Biophysics, University of São Paulo, São Paulo, Brazil.
Journal of Neurophysiology
|September 9, 2011
Summary
This study reveals that theta brainwave activity (4-8 Hz) and theta-beta phase-power coupling help regulate temporal expectations, influencing reaction times in a speeded Go/No-go task.
Area of Science:
- Cognitive Neuroscience
- Neurophysiology
- Computational Neuroscience
Background:
- Previous research links heightened temporal expectations to altered brainwave frequencies.
- The role of low-frequency oscillations in managing temporal expectations remains under investigation.
Purpose of the Study:
- To investigate if low-frequency brain oscillations regulate temporal expectations.
- To examine the neural mechanisms underlying temporal expectation adjustments.
Main Methods:
- A speeded Go/No-go task was employed to manipulate temporal expectations.
- Participants' reaction times and electroencephalography (EEG) data were recorded.
- Temporal conditional probabilities of target events were varied across conditions.
Main Results:
- Reaction times decreased significantly with higher temporal expectations at a critical interval.
- Theta activity power (4-8 Hz) over central midline sites showed significant differences between conditions.
- A transient coupling between theta phase and beta power was observed under high temporal expectation.
Conclusions:
- Theta power modulation and theta-beta phase-power coupling are key components of a central neural mechanism for temporal expectation.
- These neural adjustments fine-tune central nervous system excitability based on temporal predictions.
Related Concept Videos
01:27Feedback Regulation of Calcium Concentration
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
01:04Oscillations about an Equilibrium Position
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...