Title: Morse Code Confusions Stimuli Properties

Source: Rothkopf (1957)
 
Description: 
Two properties of Morse code signals. Each Morse code signal is a
sequence of up to five 'beeps'. The beeps can be short (0.05 sec) or
long (0.15 sec), and, when there are two or more beeps in a signal,
they are separated by periods of silence (0.05 sec). The two external
variables are:

- Signal type:

  1 = All short beeps
  2 = More short than long beeps
  3 = Same short and long beeps
  4 = More long than short beeps
  5 = All long beeps


- Signal length (in seconds):
  1 = .05 
  2 = .15
  3 = .25
  4 = .35
  5 = .45
  6 = .55
  7 = .65
  8 = .85
  9 = .95


The morse codes are:

Letter Code  Type   Length
   A   .-      3      2
   B   -...    2      4
   C   -.-.    3      5
   D   -..     2      3
   E   .       1      0
   F   ..-.    2      4
   G   --.     4      4
   H   ....    1      3
   I   ..      1      1
   J   .---    4      6
   K   -.-     4      4
   L   .-..    2      4
   M   --      5      3
   N   -.      3      2
   O   ---     5      5
   P   .--.    3      5
   Q   --.-    4      6
   R   .-.     2      3
   S   ...     1      2
   T   -       5      1
   U   ..-     2      3
   V   ...-    2      4
   W   .--     4      4
   X   -..-    3      5
   Y   -.--    4      6
   Z   --..    3      5
   1   .----   4      8
   2   ..---   4      7
   3   ...--   2      6
   4   ....-   2      5
   5   .....   1      4
   6   -....   2      5
   7   --...   2      6
   8   ---..   4      7
   9   ----.   4      8
   0   -----   5      9