Hello world¶
Source: demos/hello_world
Following programmer tradition, our first demo is as simple as possible,
and simply prints “Hello world” to the user. We’ll just show the experiment.py
file
below, though note that the experiment directory contains various other boilerplate
files too.
import psynet.experiment
from psynet.page import InfoPage
from psynet.timeline import Timeline
class Exp(psynet.experiment.Experiment):
label = "Hello world"
timeline = Timeline(
InfoPage("Hello world!", time_estimate=5),
)
Note the use of the timeline, which determines the order of events within the
experiment.
The first component of the timeline will normally be a Consent
object.
This is where we give the participant information about our experiment and
solicit their informed consent. This is an ethical requirement for most research studies.
Ordinarily each research group will have their own custom-made consent form.
Here we’ve told PsyNet to skip the consent form by including a NoConsent
object.
The second component is an InfoPage
object. Info Pages display some text to the user.
Note the time_estimate
parameter: we use this to tell PsyNet that we expect the
participant to spend about 5 seconds on this page. This information is used for
progress bar and payment estimation.
The final component is a SuccessfulEndPage
object. All PsyNet experiments must
finish with some kind of End Page. Participants who reach a Successful End Page
are marked as successful participants, rather than unsuccessful participants; this
information is primarily used for deciding how many more participants need to be
recruited.