What is Self: Definition and 584 Discussions

The self is an individual person as the object of its own reflective consciousness. Since the self is a reference by a subject to the same subject, this reference is necessarily subjective. The sense of having a self—or self-hood—should, however, not be confused with subjectivity itself. Ostensibly, this sense is directed outward from the subject to refer inward, back to its "self" (or itself). Examples of psychiatric conditions where such "sameness" may become broken include depersonalization, which sometimes occurs in schizophrenia: the self appears different from the subject.
The first-person perspective distinguishes self-hood from personal identity. Whereas "identity" is (literally) sameness and may involve categorization and labeling,
self-hood implies a first-person perspective and suggests potential uniqueness. Conversely, we use "person" as a third-person reference. Personal identity can be impaired in late-stage Alzheimer's disease and in other neurodegenerative diseases. Finally, the self is distinguishable from "others". Including the distinction between sameness and otherness, the self versus other is a research topic in contemporary philosophy and contemporary phenomenology (see also psychological phenomenology), psychology, psychiatry, neurology, and neuroscience.
Although subjective experience is central to self-hood, the privacy of this experience is only one of many problems in the Philosophy of self and scientific study of consciousness.

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  1. Len hakureu

    Help for self education on QM & Theories on Time

    im planing to educate myself . on quantum mechanics/physics . so could you please refer me 1 good fundamental QM text / reference book . and 1 book that covers all the theories on time ( space time , time line ...)
  2. S

    How to mention self study of physics in undergraduate application

    Hello all, I am a high school senior applying to college this year and have a question. Like many others on these forums, I have done a lot of self-studying of physics in my spare time, purely out of interest. How should I include self-study on a college application, and for for those you who...
  3. SuperDaniel

    Exploring Quantum Physics: A Self-Study Guide for Engineers and Scientists

    Hello, Quantum Physics is a topic that I didn't study in college, and, I do not know why, is calling my attention lately. Just to mention my background, I had 2 physics courses (mechanics and electromagnetism), and I used to study from Physics 1 and 2 by David Halliday, Robert Resnick, in early...
  4. diegzumillo

    Normal matrix as sum of self adjoint and commuting matrices

    Homework Statement I need to show that any normal matrix can be expressed as the sum of two commuting self adjoint matrices Homework Equations Normal matrix A: [A,A^\dagger]=0 Self Adjoint matrix: B=B^\dagger The Attempt at a Solution A is a normal matrix. I assume I can write...
  5. Adithyan

    Electric potential of a charged shell- Self potential?

    Homework Statement I recently encountered a problem wherein I was asked to calculate the potential difference between two non conducting concentric spherical shells of radii R1 and R2. Homework Equations ΔV=-∫E.dr The Attempt at a Solution While I was able to calculate the potentials of...
  6. A

    How can I self study a subject effectively?

    There are some classes that are not offered at my university, which I want to self study. How can I self study them effectively to get the same benefit as doing the class at university? There is this class MIT 6.024j Mathematics for Computer Science which I very much want to take online...
  7. R

    Self locking gears for parabolic solar concentrator

    Hello everyone, my question is: Would be ok to use a self locking gear like a worm gear for a solar tracker system on a 2 ton parabolic mirror dish? Would it be necessary some kind of brake system, or the worm gear would be enough? If so, are there any type of self locking gears besides the...
  8. A

    I desire to self study Physics, need a source for practice problems?

    I am a freshman (ore med). My curriculum does not have physics until junior year of college. I want to take the MCAT at the beginning of junior year. I am reading the AP Physics textbook of my high school (I didn't actually take AP Physics, I just bought the textbook) and while I am learning a...
  9. O

    Can a straight wire be a self inductor?

    I hope this is posted in the correct thread. When I was still in my physics class, we learned that a loop of wire with current can act as a self inductor. Just to refresh my memory: A loop of wire carrying current has a magnetic field around it due to current, however if the current changes...
  10. Greg Bernhardt

    Kilobots self assemble into complex shapes

    A Thousand Kilobots Self-Assemble Into Complex Shapes http://spectrum.ieee.org/automaton/robotics/robotics-hardware/a-thousand-kilobots-self-assemble https://www.youtube.com/watch?v=G1t4M2XnIhI
  11. D

    Induced V, due to self inductance?

    In a DC circuit(Yes, keep going), when current starts to flow, and that current needs a bit of time to stabilize to its maximum value. Since there is change in current(increase) there is an increasing magnetic field, a changing flux... that will induce a -V to the circuit. Eventually when...
  12. E

    Normal Distribution - self study / review

    Homework Statement My source textbook is the community college / junior college (confer: undergraduate-lower division) probability and statistics textbook: An Introduction to Mathematical Statistics and Its Applications, 2nd Edition Authors: Richard J. Larsen, Morris L. Marx 1986...
  13. E

    Self review: Statistics - Binomial Distribution

    Homework Statement The Binomial Distribution - already developed by Jacob Bernoulli (in 1713), et alii, before Abraham de Moivre (1667-1754 CE), et alii, developed the Normal Distribution as an approximation for it (id est, the Binomial Distribution) - gives the discrete probability...
  14. P

    Looking for a physics book for self learning

    Hi, I'm a 19 year old boy who's never been in a maths or physics high school class for a number of reasons. I learned to swim by myself when I was 7, after failing to attend courses because I would panic every time. So I saw no reason I could not learn my country's high school math, then...
  15. M

    Can a Self-Feeding Steam Turbine Recycle Its Own Water?

    I'm trying to design or find a design for a steam turbine that recycles it's water, or at least a large percentage of it, to prevent refilling of a boiler tank. My thoughts; The turbine will be powered by steam heated through copper tubing which is fed from a large unheated, (or partially...
  16. M

    Good differential geometry textbooks/books for self study?

    Any good textbooks on differential geometry for self study? I'm not the best at reading comprehension. I've already studied Calculus, differential equations, and linear algebra.
  17. 1

    Time Dilation on Spinning Atoms?

    would time dilation occur if for example, i was making a hydrogen atom spin with the center of spin the atom? would time dilation occur? because it didn't really traveled distance... or, if so spin a muon, would it decay faster if i was to spin it in an incredible amount of speed? but then if...
  18. J

    Where to self teach Algebra 2?

    So I made another post to explain my position, and I need to learn Algebra 2B this summer (The B part or second half) In order to test out of it next school year and then take trig. So I was wondering if anyone knew a good source to self teach algebra 2B, maybe an online course, or a website...
  19. Syed_Ali

    What are the best books for self-studying undergraduate level Physics?

    Hello. I am an MD but Physics excites me. Interested in Physics, I want to self study the subject from the beginning so that I can come to grips with the subject. I have a sound mathematical background and I know I can study myself but help regarding books would be appreciated. So please anyone...
  20. P

    Would like to introduce my self Love the forums

    Hello Physics forums, I have previously very long ago made an account on this forum after having visited it so much, but i never really posted anything. Now, I come back after witnessing the physics forums app on the apple appstore. I love to just scroll around the physics section and see what...
  21. B

    Is the analytic properties of Fermionic self energy well known?

    For arbitrary Fermionic self energy, \Sigma(i wn) with wn=(2n+1)pi T, its real part is always an even function of wn while its imaginary part is always an odd function of wn.
  22. L

    Self Inductance of a Solenoid Problem

    Homework Statement Hi again guys, been stuck on this problem for a while now, thought it would be a simple bumping in some values in a given equation question but I can't get the correct answer :confused: Heres the problem: What is the inductance of a 600 turn coil wound on a core of cross...
  23. R

    Self Energy of a thin insulating cylinder

    Any idea how to approach finding the self energy of an infinitely long, thin insulating cylinder. It's got linear charge density so I can probably express the self energy as energy/length. I just don't know how to approach it.
  24. S

    Finding Self Isomorphisms in Graphs

    Homework Statement I'm given a graph and am told to find non-trivial self isomorphisms. Non-trivial meaning that at least 1 node is "not mapped onto itself." I've tried looking for self isomorphism but I can't find anything. I can tell when two graphs are isomorphic through inspection but...
  25. A

    Richard Feyman's lectures on physics as a resource for self study?

    I was planning on using Richard Feynman's lectures on physics to study for high school ap tests on mechanics and electromagnetism. I don't know how in depth Feynman's lectures go, since there are no problems but I've heard it works when you're trying to grasp the material. However, I don't know...
  26. ecoo

    Self Learning Calculus From the Beginning

    Math Topics to Self Study Any recommendations for a 9th grader? I have taken algebra 1 and 2 and am currently taking geometry. I find that math class is sometimes very slow. I understand that some students need extra help, but for me it's a bit slow. So to take initiative, I want to learn...
  27. C

    Chemistry A *great* general chemistry book for self study -

    In this post i want to discuss good chemistry textbooks vs. bad chemistry textbooks and I'd like some help finding a good General chemistry textbook for university - Undergraduate level. What Is a good introductory chemistry textbook? So i finally found a book in organic chemistry which...
  28. Manraj singh

    Antimatter Self: Does Our Antimatter Form Exist?

    I read that every particle in the universe has an antimatter form of itself. Does that mean there exists an antimatter form of ourself? If so, where is this antimatter form of ourself? This question might be stupid, but I'm just curioous.
  29. L

    Mechanics - factored self weight of an object

    Mechanics -- factored self weight of an object How would you find the factored self weight of an object, suppose you are given the the dimensions and mass per metre of the object. Would you find the unit weight first by multiply by 9.81 and then multiplying the volume to find the UDL?
  30. Entanglement

    Is back EMF equal to the induced EMF in self-induction?

    In the case of self induction, when the intensity increases gradually an emf is induced which generates a back current " equal in magnitude, opposite in direction " to oppose the increase, so if that is right shouldn't the intensity in the coil Become ZERO till the intensity becomes steady?
  31. Sudharaka

    MHB Self Adjoint and Unitary Transformations

    Hi everyone, :) Here is a question I encountered recently. Question: Let \(V\) be a unitary space. Give the definitions of a self adjoint and unitary linear transformations of \(V\). Prove that \(f_1 g_1=f_2 g_2\), where \(f_1,\,f_2\) are self adjoint positive and \(g_1,\,g_2\) unitary...
  32. kira506

    Understanding Self-Inductance of a Coil: How Does it Happen?

    Self inductance of a coil : how does it happen ? I've got some hardtime trying to imagine how it happens , the phrase which confused the most while studying was "each turn acts as a small magnet ",so why does it change polarities at the moment of switching the circuit on or off ? Also the whole...
  33. F

    MHB Show Self-Adjointness of Operator E on $L_{2}$ of Square Integrable Functions

    Conisider the space $L_{2}$ of square integrable functions on R with the usual integral inner product. Show that the operator E defined by, for f in $L_{2}$, $(Ef)(x)=0.5(f(x)+f(-x)$ is self adoint. It seems that in order for this to be true we have that f(-x) is the conjugate of f(x) but I...
  34. M

    Energy Self-Shielding: Explaining the Concept

    Can someone explain the concept to me? As far as I know, in some energy interval there are materials which have resonance absorption. The book then goes on to say that energy self shielding does something to combat this absorption but I am not clear on how and hope someone can clear this up for me.
  35. A

    Self capacitance spherical grain

    I have been given the exercise above which relates to an article we are reading. I can calculate all the results but I can't interpret them physically. I think my major problem is that I don't see how self capacitance is a physically measureable quantity. For a recap the self capacitance is...
  36. C

    Self Study for Physics for a mechanical engineer

    I am a mechanical engineer with 2 1/2years working experience. I have a Bachelor degree in Science (Mechanical Engineering). Physics is one of my favorite subject when I was in high school. Even though I already graduated from University, during my free time, I will self study Physics. I have an...
  37. K

    EM waves- self propagating in a vacuum?

    First of all, I understand that an EM wave is created by a charged particle that is moving. What I don't understand is how it propagates itself when traveling through a vacuum as there is no medium for it to interact with. Can this be explained by anything other than photon theory? I really...
  38. I

    Self Study for AP Physics B or Stick with AP Physics 1 Next Year?

    Hello It has come to my attention that the AP Physics B test is being replaced with AP Physics 1 and 2 for the 2014/15 school year. I'm currently a junior in high school enrolled in a CP Physics course, and I had planned to take AP Physics B in my senior year. However, with these changes, I...
  39. M

    Coulomb force and the self electric field

    The well-known connection between the electric field and Coulomb's law is that The magnitude of the electic field at distance r from a point-charge Q is E=Q/r^2The definition of E is that the force exerted the field on a point-charge q is F=qE. These two equalities yield the F=qQ/r^2...
  40. R

    Self Inductance of a Cylindrical Current-Carrying Wire

    Consider a solid cylinder of radius R. an varying current of current density δ flows through. what would be self inductance of that cylinder
  41. B

    Looking for a good Quantum Mechanics book for self study.

    I majored in physics in college and have a master's degree from Michigan State Univ. in physics. I just recently retired and have the urge to revisit some of my old studies. In the last year I've refreshed the intellectual side of myself by working thru a calculus book and book on differential...
  42. D

    Positioning one's self for Industry-funded PhD

    I have a BS in MechE, and work in R&D. I've been plugging away at my MS in MechE, about halfway through, and have been considering that a PhD may really be more intellectually and personally what I want. I've spoken to some old professors and friends with doctorates. I don't think I'm ready...
  43. O

    AP Physics C Self-Study: Best Textbooks for Algebra & Calculus

    Hello, I am self studying to take the Ap Physics C test. I already know algebra based mechanics, although i DO NOT know calculus based. I have no knowledge on electricity. What textbook should i use?
  44. R

    Braking radiation and electromagnetic self action

    It is known that a charged particle moving with some acceleration emits electromagnetic waves. For example, this may be a particle moving at a constant speed on the circle. In this case the radiation of a particle is called the braking radiation, the cyclotron radiation, or the synchrotron...
  45. QuantumCurt

    Self study supplements for geometry?

    Please move this if it's not the appropriate section of the forum. Could anyone point me towards some good supplements for self studying geometry? I just finished trigonometry, and I'm starting calculus, and algebra/trig based physics in a few weeks once fall courses start. However, I've...
  46. C

    School education vs online self learning

    With the internet as large and powerful as ever, YouTube videos with lectures and tutorials, what kind of fool would pay thousands of dollars to go to school and get a piece of paper that says their qualified when they can do it all in their own time for free? Goodbye tradition...
  47. P

    Mechanical Energy - Self energy of Universe

    What is the total mechanical energy (self energy) of the universe that is due to the fact that it expands, taken the big bang as the origin - on the basis of general relativity? If anyone could supply me with the equation and number (what size is it in kgm2/s2) I would be very thankful.
  48. C

    Attempting to create a self rotating magnetic bike

    Hi all, new on here so thanks in advance for your responce's I am an avid cyclist and competant engineer, i dislike oil and gas so much i do not own a car. I cycle everywhere. I am tired of wanting to go long distances without assistance or a high top speed. I want to build a cycle with...
  49. R

    Personal enrichment: Self study vs Formal study

    Hey everyone, I want to see if anyone can give me their perspectives on my academic interests and situation. I know up front that this comes down to personal preference, but I want to see if anyone had any thoughts that might push me one way or another. I am a physician who is somewhat...
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