Fixation Hole Training
Fixation Hole Training - Related Videos
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
01:10
Detection of Black Holes
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2023
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s. Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light. Not until the 1960s, when the first neutron...
07:51
Acrylic Resin Molding Based Head Fixation Technique in Rodents
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Cited by 4 •
2016
Traditional head fixation techniques have used metallic frames attached on the skull as an interface for head fixation apparatus. This protocol demonstrates a frameless, acrylic resin molding based head fixation technique for behavioral tasks in rodents.
08:16
The Modified Hole Board - Measuring Behavior, Cognition and Social Interaction in Mice and Rats
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Cited by 28 •
2015
This protocol describes the modified hole board, which is a behavioral test set-up that comprises the characteristics of an open field and a traditional hole board. This set-up enables the differential analysis of unconditioned behavior of small laboratory mammals as well as the analysis of cognitive abilities.
01:03
Fixation and Sectioning
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2023
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens. The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
FAQs
Reinforcement links the animal’s gaze behavior to a defined trial requirement. When the eyes enter the permitted fixation area and remain there for the specified interval, the subject receives a reinforcing outcome. This contingency encourages consistent gaze placement and duration, allowing later behavioral measurements to reflect controlled visual behavior rather than uncontrolled looking patterns.
The fixation interval establishes a consistent period during which the animal’s gaze remains within the accepted area. This timing helps align visual stimulus presentation and behavioral recording across trials. By requiring sustained rather than momentary fixation, the procedure supports more reliable comparisons of eye movements, visual attention, and responses to controlled stimuli.
A departure from the required fixation area can end or reset the trial, depending on the training arrangement. This consequence distinguishes successful sustained fixation from brief or unstable gaze placement. It also reinforces the relationship between maintaining the target behavior and completing a trial, which helps reduce variability in subsequent eye-tracking and stimulus-response measurements.
Presenting a visual stimulus alone does not ensure that an animal begins each trial from a comparable gaze position or maintains attention during the relevant interval. Fixation Hole Training adds an operant requirement for eye placement and duration. That added behavioral control makes stimulus responses easier to interpret because gaze position and timing are constrained before measurement begins.
A trial establishes a defined fixation location, then the animal places its eyes within the required area and maintains gaze for the specified interval. Successful performance produces reinforcement, whereas leaving the area may terminate or reset the trial. Repeating this contingency trains stable fixation and prepares the subject for controlled visual-behavior experiments.
Researchers use the procedure when experiments require precise control over gaze before measuring visual behavior. It is especially relevant to studies combining eye tracking with neural recording or controlled visual stimulus presentation. By improving consistency across trials, the training helps researchers relate recorded eye movements, attention, and stimulus responses to comparable behavioral starting conditions.
The procedure supports measurements of eye movements, visual attention, and responses to visual stimuli under controlled behavioral conditions. It can also improve the reliability of experiments that record neural activity while monitoring gaze. The resulting data are more interpretable because the subject’s fixation location and required holding period provide a consistent framework for comparing trial outcomes.