Revise second step of the code-based study building tutorial

Author: FelixHenninger

docs/learn/code/study.rst

@@ -1,19 +1,6 @@
 Building a working study
 ========================
 
-.. note::
-  **This documentation page is currently under development. Sorry for that!**
-
-  We're actively working on this, so there might be parts that are missing or
-  incomplete. Please be invited to start with the tutorial nonetheless,
-  the additional parts are coming very soon.
-
-  If you find something awry or missing content, please don't hesitate to send
-  us a line or two, we're happy to explain things further or to give you a
-  personal tutorial via Skype/Hangouts/etc. or in person.
-
-  Sorry for the trouble!
-
 .. raw:: html
 
   <style>
@@ -36,140 +23,90 @@ Building a working study
    :align: right
    :class: screenshot
 
-**This is where we build our first working study!** Specifically, we're going to
-create an experiment that demonstrates the *Stroop effect*. This effect
-describes the interference between a written word's content and its visual
-characteristics: `John Ridley Stroop <https://en.wikipedia.org/wiki/John_Ridley_Stroop>`_
-demonstrated that naming the color of a word is harder (takes longer) when the
-word denotes a different color. An example for such an *incongruent* display
-might be the word :blue:`red`. Conversely, in the word and color can correspond
-(be *congruent*), which makes the task easier.
+**This is where we build our first working study!** Specifically, we're going to create an experiment that demonstrates the *Stroop effect*. This effect describes the interference between a written word's content and its visual characteristics: `John Ridley Stroop <https://en.wikipedia.org/wiki/John_Ridley_Stroop>`_ demonstrated that naming the color of a word is harder (takes longer) when the word denotes a different color. An example for such an *incongruent* display might be the word :blue:`red`. Conversely, if the word and color correspond (are *congruent*), participants can perform the task faster.
+
+.. contents:: Contents
+  :local:
+  :depth: 1
+
+----
 
 Picking back up
 ---------------
 
-This section builds on the previous one, in which you `downloaded the starter
-kit <https://github.com/FelixHenninger/lab.js/releases>`_ and took at first look
-how a minimal 'experiment' was constructed from individual components. You also
-made the code run by adding or uncommenting ``experiment.run()``. We'll build
-upon the same code, so please make sure you have the files and an editor handy.
+This section builds on the previous one, in which you `downloaded the starter kit <https://github.com/FelixHenninger/lab.js/releases>`_ and took at first look how a minimal 'experiment' was constructed from individual components. You also kicked off the study by adding or uncommenting ``study.run()``. We'll build upon the same code, so please make sure you have the files and a text editor handy.
 
-If didn't go through the initial steps and don't feel confident looking at the
-starter kit code, please go back and take a quick look. You're always welcome to
-`reach out if you need help <https://github.com/FelixHenninger/lab.js#find-help>`_
-right now or in any of the following steps.
+If didn't go through the initial steps and don't feel confident looking at the starter kit code, please go back and take a quick look. You're always welcome to `reach out if you need help <https://lab.js.org/resources/support/>`_ right now or in any of the following steps.
 
 With that, let's get going!
 
+----
+
 Thinking about a study's structure
 ----------------------------------
 
-**When we build our studies, we'll think about them in a particular way: As a
-sequence of individual building blocks. What does that mean?**
+**When we build our studies, we'll think about them in a particular way: As a sequence of individual building blocks. What does that mean?**
 
-Every *component* performs a particular function -- it might show some
-information onscreen, play a sound, or do some processing in the background.
-Each component *prepares*, often at the beginning of the experiment, readying
-for its task, and will *run* later, to perform its main function.
+Every *component* performs a particular function -- it might show some information onscreen, play a sound, or do some processing in the background. Each component *prepares*, often at the beginning of the experiment, readying for its task, and will *run* later, to perform its main function.
 
 .. figure:: study/2-component-timeline.svg
    :alt: Individual component timeline
    :figwidth: 100%
    :width: 100%
    :align: center
 
-As just noted, every component's moment in the spotlight is when it runs. This
-will very often mean showing some information, and then waiting for a response.
-A typical experiment will consist of many such components strung together like
-this:
+As we just discussed, every component's moment in the spotlight is when it runs. This will very often mean showing some information for a fixed amount of time, or waiting for the participants' response. A typical experiment will often consist of many such components strung together, for example like this:
 
 .. figure:: study/3-multiple-components.svg
    :alt: Multiple components in sequence
    :figwidth: 100%
    :width: 100%
    :align: center
 
-When we build experiments, components will not only be responsible for
-presenting stimuli and collecting responses. We will use different components to
-tie the structure of our experiment together. For example, the stimuli above are
-shown sequentially, and therefore together constitute a *sequence*.
-Accordingly, we'll use a *sequence component* to group them together.
+When we build experiments, components will not only be responsible for presenting stimuli and collecting responses: We will also use different components to tie the structure of our experiment together. For example, the stimuli above are shown sequentially, and therefore together constitute a *sequence*. Accordingly, we'll use a *sequence component* to group them together.
 
 .. figure:: study/4-sequence.svg
    :alt: Components nested in a sequence
    :figwidth: 100%
    :width: 100%
    :align: center
 
-In many ways, a sequence component behaves exactly as a standard component
-would: It prepares by signaling all nested components to prepare themselves,
-and it runs by running them in sequence.
+In many ways, a sequence component behaves exactly as a standard component would: It prepares by signaling to all nested components to get ready themselves, and it runs by running them in sequence.
 
-A sequence differs from a stimulus component in that it does not provide any new
-information to the viewers. Instead, it is in charge of *flow control*: It makes
-sure that other components run when they are supposed to. These *nested
-components* can then do the actual work of presenting information, or they might
-themselves organize the flow of yet another set of components.
+A sequence differs from a stimulus component in that it does not provide any new information to the viewers. Instead, it is in charge of *flow control*: It makes sure that other components run when they are supposed to. These *nested components* can then do the actual work of presenting information, or they might themselves organize the flow of yet another set of components.
 
-We'll always combine both types, presentational components and flow control
-components, to build studies.
+We'll always combine both types, presentational components and flow control components, to build studies.
 
 Building a Stroop screen
 ------------------------
 
-**Knowing what you now know, what might be a good component to start building
-a Stroop experiment?** We're going to start with the main stimulus display
-itself, the part that displays the word and color, and collects the response.
+**Knowing what you now know, what might be a good component to start building a Stroop experiment?** We're going to start with the main stimulus display itself, the part that displays the word and color, and collects the response.
 
-First, let's think about how to design the stimulus. For the purposes of this
-tutorial, we'll use ``HTML`` to tell the browser what we'd like to show
-onscreen [#f1]_. We'd like to show a word, and give it a color. The syntax
-required to do this will probably look somewhat like the following:
+First, let's think about how to design the stimulus. For the purposes of this tutorial, we'll use ``HTML`` to tell the browser what we'd like to show onscreen [#f1]_. We'd like to show a word, and give it a color. The syntax required to do this will probably look somewhat like the following:
 
 .. code-block:: html
 
    <div style="color: red">
      blue
    </div>
 
-Given this content, let's build a component that will make it visible to the
-participants by inserting the ``HTML`` syntax into the page. This is the purpose
-of the :js:class:`html.Screen` component that you may have noticed in the
-starter kit code. By extending our earlier 'hello world' example, we might
-create the following snippet::
+Given this content, let's build a component that will make it visible to the participants by inserting the ``HTML`` syntax into the page. This is the purpose of the :js:class:`html.Screen` component that you may have noticed in the starter kit code. By extending our earlier 'hello world' example, we might create the following snippet::
 
   new lab.html.Screen({
     content: '<div style="color: red"> blue </div>',
   })
 
-This creates a new :js:class:`html.Screen` with our content. When it runs, the
-short ``HTML`` code will be inserted into the page, specifically into the
-element whose ``data-labjs-section`` attribute is ``main`` (this default can be
-changed).
-
-There are a few details to note here: First, the screen is constructed using
-options which are supplied in brackets -- and not only regular ones, but also
-curly braces. This is because the options are defined by a dictionary (you
-might also use the term object) which has pairs of keys and values, separated by
-a colon. Right now, only one option is provided: The content in form of our
-``HTML`` text. If we were to add further options, we would need to insert commas
-between them, a fact that is hinted at by the comma behind the option. Second,
-it's worth noting that the the quotation marks around and with the ``HTML`` code
-are different. This is because the simple quotation marks denote the beginning
-and the end of the string, whereas the double quotation marks are part of its
-content. Using single quotation marks within the ``HTML`` code would end the
-string prematurely and cause an error.
+This creates a new :js:class:`html.Screen` with our content. When it runs, the short ``HTML`` code will be inserted into the page, specifically into the element whose ``data-labjs-section`` attribute is ``main`` (this default can be changed).
+
+There are a few details to note here: First, the screen is constructed using options which are supplied in brackets -- and not only regular ones, but also curly braces. This is because the options are defined by a dictionary (you might also use the term object) which has pairs of keys and values, separated by a colon. Right now, only one option is provided: The content in form of our ``HTML`` string, enclosed in quotation marks to indicate that the browser should treat it as literal text rather than as a command. If we were to add further options, we would need to insert commas between them, a fact that is hinted at by the comma behind content option.
+Second, it's worth noting briefly that the the quotation marks around and within the ``HTML`` code are different. This is because the simple quotation marks denote the beginning and the end of the string, whereas the double quotation marks are part of its content. Using single quotation marks within the ``HTML`` code would end the string prematurely and cause an error -- that's something to look out for.
 
 If you've changed the code to correspond to the above example and reloaded the
 page in your browser, you should see the word blue on the screen, written in red.
 It's not (yet) as pretty as it could be, but it'll do for the moment: We'll get
 around to :ref:`styling our study <tutorial/style>` later!
 
 .. [#f1] This is not the only way to design the display. If you're used to
-  writing code that draws shapes and text at exact screen coordinates, don't
-  worry: That is also possible using :ref:`canvas-based displays
-  <reference/canvas>`.
+  writing code that draws shapes and text at exact screen coordinates, don't worry: That is also possible using :ref:`canvas-based displays <reference/canvas>`.
 
-  Both approaches have their advantages and disadvantages: We'll discuss these
-  at a later point. For now, we decided to give up some control over the precise
-  display in return for a simpler method of stimulus construction.
+  Both approaches have their advantages and disadvantages: We'll discuss these at a later point. For now, we decided to give up some control over the precise display in return for a simpler method of stimulus construction.