Run-and-pull Task
Run-and-pull Task - Related Videos
11:45
Piaget's Conservation Task and the Influence of Task Demands
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2023
Source: Laboratories of Judith Danovitch and Nicholaus Noles—University of Louisville Jean Piaget was a pioneer in the field of developmental psychology, and his theory of cognitive development is one of the most well-known psychological theories. At the heart of Piaget’s theory is the idea that children’s ways of thinking change over the course of childhood. Piaget provided evidence for these changes by comparing how children of different ages responded to questions and problems that he...
07:51
Pull-down of Calmodulin-binding Proteins
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Cited by 19 •
2012
Calmodulin (CaM) pull-down assay is an effective way to investigate the interaction of CaM with various proteins. This method uses CaM-sepharose beads for efficient and specific analysis of CaM-binding proteins. This provides an important tool to explore CaM signaling in cellular function.
08:08
Co-Immunoprecipitation and Pull-Down Assays
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2023
Co-immunoprecipitation (CoIP) and pull-down assays are closely related methods to identify stable protein-protein interactions. These methods are related to immunoprecipitation, a method for separating a target protein bound to an antibody from unbound proteins. In CoIP, an antibody-bound protein is itself bound to another protein that does not bind with the antibody, this is followed by a separation process that preserves the protein-protein complex. The difference in pull-down assays is that...
06:26
Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
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Cited by 42 •
2017
Many proteins in the cell sense and induce membrane curvature. We describe a method to pull membrane nanotubes from lipid vesicles to study the interaction of proteins or any curvature-active molecule with curved membranes in vitro.
12:18
An Instrumented Pull Test to Characterize Postural Responses
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Cited by 1 •
2019
Impairment of postural reflexes, termed postural instability, is difficult to quantify. Clinical assessments such as the pull test suffer issues with reliability and scaling. Here, we present an instrumented version of the pull test to objectively characterize postural responses.
FAQs
The assay links two observable phases of behavior: approach through locomotion and completion through pulling. Examining these phases together shows whether an animal reaches the target but struggles with the response, or whether altered running limits access to it. This separation supports analysis of coordination, physical effort, and goal-directed performance.
Performance measures should be read as complementary rather than interchangeable. Task completion indicates whether the goal-directed action was achieved, response latency captures how quickly the subject responds, running speed reflects locomotor performance, and pulling force indexes the strength of the effortful component. Together, these measures help distinguish broad behavioral changes from phase-specific alterations.
Motivation and learning can influence performance without producing identical changes in every measure. As an animal acquires the action, task completion or response latency may change, while running speed and pulling force provide additional information about movement and effort. Considering all four measures helps characterize behavioral change more precisely.
Patterns across measures provide the relevant distinction, although no single measure is sufficient. Changes in running speed or pulling force can indicate altered locomotor or effort-related performance, whereas changes in completion or latency may reflect goal-directed, motivational, or learning-related effects. Interpreting the measures together avoids reducing behavior to one score.
The assay is useful when researchers need to compare coordinated action across altered neural function, training, or disease-related conditions. It can expose changes in motor performance, physical effort, motivation, or learning by tracking several aspects of the same goal-directed behavior. This makes it suitable for evaluating behavioral differences between experimental conditions.
Task completion provides an outcome-level measure: it shows whether the animal achieved the intended goal, whereas speed and force describe particular components of performance. A subject could therefore show measurable locomotion or pulling without demonstrating successful completion. Including completion alongside continuous performance measures gives the comparison greater behavioral context.