[solved] count keystrokes in a specified time

sundar

HI ,
I am looking at counting the keystrokes in a specified set duration .
want to know how can this be achieved .
I do see a variable "count_keyboard_response".
which i am currently unable to use .
It would be great if there is some pointers to this.

Regards,
Sundar.

Edwin

Hi Sundar,

The count_keyboard_response variable tells you how often the keyboard_response item has been run. Each keyboard_response item, per definition, collects only one keypress.

If you would like to count how often participants press a key, you could do with a little Python inline scripting:

from openexp.canvas import canvas
from openexp.keyboard import keyboard

# create a new canvas object, showing instructions
my_canvas = canvas(exp)
my_canvas.text("Press Space as often as you can!")

# create a new keyboard object, with only Space presses allowed
my_keyboard = keyboard(exp, keylist=['space'], timeout=1)

# starting value for the keypress counter
presscount = 0

# run for ten seconds
t0 = self.time()
while self.time() - t0 < 10000:
    # check if there is a new keypress
    key, presstime = my_keyboard.get_key()
    # add one to the count if there was a keypress
    if key != None:
        presscount += 1

# store the keypress as in OpenSesame workspace
exp.set("keypress_count", presscount)

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# EVERYTHING BELOW HERE CAN BE REPLACED BY OPENSESAME ITEMS #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

# show a blank display for a second, signalling the participant to stop
my_canvas.clear()
my_canvas.show()
self.pause(1000)

# show the result
my_canvas.text("You pressed Space %d times" % presscount)
my_canvas.show()

# wait for a keypress before continuing
my_keyboard.get_key(timeout=None)

The code is pretty self explanatory. Also, please note that everything below the marker can be replaced by a blank sketchpad with a Duration of 1000 ms, and a sketchpad with a Duration of keypress and a text like this: You pressed Space [keypress_count] times.

Good luck!

sundar

Thanks Edwin,
This trick worked pretty well with python script.
Also let me know how do i pass this variable "presscount"
to be logged in in the logger .

Regards,
Sundar.

Edwin

Go to your logger, click Add custom variable, type keypress_count.

Also, it might be wise to go through some tutorials and the documentation pages.