<s>
PsychoPy	B-Library
is	O
an	O
open	B-Application
source	I-Application
software	I-Application
package	O
written	O
in	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
primarily	O
for	O
use	O
in	O
neuroscience	O
and	O
experimental	O
psychology	O
research	O
.	O
</s>
<s>
Developed	O
initially	O
as	O
a	O
Python	B-Language
library	O
and	O
then	O
as	O
an	O
application	O
with	O
a	O
graphical	O
interface	O
,	O
it	O
now	O
also	O
supports	O
JavaScript	B-Language
outputs	O
to	O
run	O
studies	O
online	O
and	O
on	O
mobile	O
devices	O
.	O
</s>
<s>
Unlike	O
most	O
packages	O
,	O
it	O
provides	O
users	O
with	O
a	O
choice	O
of	O
interface	O
-	O
they	O
can	O
generate	O
experiments	O
by	O
writing	O
Python	B-Language
scripts	I-Language
,	O
use	O
a	O
graphical	O
interface	O
that	O
will	O
generate	O
a	O
script	O
for	O
them	O
,	O
or	O
combine	O
both	O
methods	O
.	O
</s>
<s>
Its	O
platform	B-Operating_System
independence	I-Operating_System
is	O
achieved	O
through	O
use	O
of	O
the	O
wxPython	B-Language
widget	O
library	O
for	O
the	O
application	O
and	O
OpenGL	B-Application
for	O
graphics	O
calls	O
.	O
</s>
<s>
According	O
to	O
its	O
usage	O
statistics	O
page	O
,	O
Psychopy	B-Library
was	O
launched	O
on	O
more	O
than	O
20,000	O
different	O
computers	O
in	O
November	O
,	O
2018	O
,	O
and	O
has	O
gained	O
relative	O
usage	O
by	O
month	O
every	O
year	O
since	O
its	O
initial	O
release	O
in	O
2003	O
.	O
</s>
<s>
PsychoPy	B-Library
is	O
continually	O
updated	O
with	O
5-10	O
releases	O
each	O
year	O
,	O
containing	O
new	O
features	O
and	O
bug	O
fixes	O
.	O
</s>
<s>
Here	O
are	O
some	O
major	O
releases	O
in	O
the	O
history	O
of	O
PsychoPy	B-Library
:	O
</s>
<s>
2002	O
:	O
PsychoPy	B-Library
was	O
originally	O
written	O
by	O
Peirce	O
as	O
a	O
proof	O
of	O
concept	O
-	O
that	O
a	O
high-level	O
scripting	O
language	O
could	O
generate	O
experimental	O
stimuli	O
in	O
real	O
time	O
(	O
existing	O
solutions	O
,	O
such	O
as	O
Psychtoolbox	O
,	O
had	O
to	O
pre-generate	O
movies	O
or	O
use	O
CLUT	O
animation	O
techniques	O
)	O
.	O
</s>
<s>
2003-2005	O
:	O
this	O
was	O
extended	O
to	O
be	O
able	O
to	O
generate	O
experiments	O
in	O
the	O
author	O
's	O
lab	O
at	O
Nottingham	O
University	O
and	O
made	O
available	O
as	O
an	O
open	B-Application
source	I-Application
project	O
on	O
the	O
internet	O
.	O
</s>
<s>
At	O
this	O
time	O
PsychoPy	B-Library
was	O
a	O
library	O
(	O
Python	B-Language
package	O
)	O
that	O
could	O
be	O
imported	O
by	O
Python	B-Language
scripts	I-Language
.	O
</s>
<s>
September	O
2014	O
:	O
Version	O
1.81	O
released	O
,	O
including	O
the	O
ability	O
to	O
specify	O
PsychoPy	B-Library
version	O
in	O
the	O
experiment	O
.	O
</s>
<s>
PsychoPy	B-Library
will	O
then	O
load	O
this	O
version	O
during	O
run-time	O
,	O
regardless	O
of	O
the	O
version	O
installed	O
-	O
including	O
future	O
versions	O
.	O
</s>
<s>
March	O
2018	O
:	O
Version	O
1.90	O
released	O
,	O
first	O
version	O
with	O
Python	B-Language
3	O
support	O
.	O
</s>
<s>
Jan	O
2019	O
:	O
Support	O
for	O
PC	O
connected	O
Oculus	B-Application
VR	I-Application
headsets	O
.	O
</s>
