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Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
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Radical Formation: Abstraction00:47

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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Entorhinal transformations in abstract frames of reference.

Raphael Kaplan1,2, Karl J Friston1

  • 1Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom.

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|May 4, 2019
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Summary
This summary is machine-generated.

The brain transforms social preferences using the entorhinal/subicular region, similar to spatial navigation. This area processes absolute preference differences, aiding in understanding others' decisions.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Science

Background:

  • Understanding others' preferences is crucial for social decision-making.
  • The brain mechanisms for transforming relative social preferences are not well understood.
  • The hippocampal-entorhinal system's role in spatial coordinate transformation is established.

Purpose of the Study:

  • To investigate if the hippocampal-entorhinal system transforms relative social preferences in abstract decision spaces.
  • To identify brain regions involved in comparing personal preferences with others' preferences.
  • To explore the neural basis of abstract decision-making.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to monitor brain activity.
  • Participants learned a stranger's activity preferences relative to known individuals.
  • Participants made decisions about how the stranger's preferences related to others' preferences.

Main Results:

  • Entorhinal/subicular regions showed responses to the absolute difference in preference ratings.
  • These entorhinal/subicular signals were sensitive to the specific individuals being compared.
  • Striatal signals correlated with accurately determining the ordinal position of choices relative to the stranger.

Conclusions:

  • The entorhinal/subicular region plays a role in processing abstract preferences, analogous to its function in spatial navigation.
  • These findings suggest the entorhinal cortex integrates relative social information into abstract metric spaces.
  • The study highlights the neural basis for understanding social comparison and decision-making.