RSVP Stream

rayna

I am creating an attentional blink experiment where the RSVP stream is a 680 item stream of alphabets randomly sampled from letters C to Z. There are also As and Bs that randomly appear in this stream, 10 times each at varying position intervals of 14 to 34 letters. How do I use random.choice function to create this stream. If random.choice cannot not be used for this, please help me with some other function that can do this.

Best,

Rayna

eduard

Hi rayna,

Maybe this script helps you:

import random
stimuli = []
number_stimuli_desired = 680
# make a default set of values to pull from
letter_set = ['z','y','c','d','e']
# first make the distractor lists
for n in range(number_stimuli_desired):
     stimuli.append(random.choice(letter_set))

# then add the targets
targets = ['a','b']*10 # 20 targets
random.shuffle(targets)
while True:
     idx = random.randint(14,680)
     add_idx = True
     for n in range(idx-14:idx+14):
         if stimuli[n] in ['a','b']:
              add_idx = False
     if add_idx:
          stimuli.insert(targets.pop(),idx)
     if len(targets)==0:
         break

Eduard