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5 relative numerosity discrimination from honig

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Unformatted text preview: with patterns composed of 16 dots Adapted from Honig & Stewart, 1989. 5 Relative numerosity discrimination from Honig & Stewart, 1989 Relative numerosity generalization gradients for a group of pigeons who were tested with patterns containing either 16 or 36 elements Counting & Absolute number Counting Responses Rumbaugh & Washburn (1993) -  - Trained a chimpanzee to move a cursor with a joystick - Arabic numeral presented (1, 2, 3 etc.) - Arrays of rectangles presented: chimp required to delete the number of rectangles = Arabic number, which it did (eventually!) Counting Sequential Stimuli Meck & Church (1983) Rats rewarded for pressing: - Left lever after 2 pulses of noise - Right lever after 8 pulses of noise - Discrimination solved with ease Breukelaar & Dalrymple-Alford (1998) - Replicated Meck & Church’s experiment - Varied the duration of bursts from trial to trial - Problem could not be solved by timing 7 Counting Control for time (duration) Control for number •  Rats are sensitive to time and number Are time and number coded together? Counting: Time vs number Case 1 Case 2 Conditional time/number discrimination with flashing colored keys: •  if Green, then peck left for 2 flashes, right for 8 flashes, regardless of duration •  if Red, then peck left for 2 sec, right for 8 sec, regardless of number of flashes •  Test with 2-8 pulses over 4 sec (counting), or 4 pulses lasting 2-8 sec (timing) Ti...
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