The relationship between the strength of the conditioned stimulus and the size of the resulting conditioned reflex / by P.S. Kupalov and W. Horsley Gantt.

  • Kupalov, P. S. (Petr Stepanovich), 1888-
Date:
[1926?]
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Licence: In copyright

Credit: The relationship between the strength of the conditioned stimulus and the size of the resulting conditioned reflex / by P.S. Kupalov and W. Horsley Gantt. Source: Wellcome Collection.

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    the bottle.^ In anG#be¥fdog j| reflexwas established to an electric bell and a metronome 160, and a negative conditioned reflex to the metronome 90, and then a reflex to the tone “Do” of a pitch-pipe. All these reflexes were built upon the unconditioned food reflex (feeding with a moist meat-bread powder). Obse-rv&ticm 1.—Using the dog “ Ilegdie, ” the following complex conditioned stimulus was employed : thirty flashes per second of a 400 candle-power lamp with a tone of Gabon’s whistle (1,500 vibra¬ tions). A reflex was established after the second trial and rapidly became stable, that is, it gave constant manometer readings. After the thirteenth combination of this stimulus with feeding, the light stimulus alone unaccompanied by feeding was tried. It gave the same response as the complex light-sound stimulus. On the following day, the complex stimulus having retained its potency, the tone stimulus alone was employed. It gave a secretion of six divisions on the manometer, that is, a response 12‘5 per cent, of the response to the light-sound complex. These observations are recorded in the following table :— Table I.—Dog “Rogdie.” Time Number of trials Conditioned stimulus Duration of stimulus Latency of response Manometer reading With feeding = + Without ,. — - (Oct. 22,1925) 4.33 35th Bell 30 sec. 16 sec. 28 + 4.40 43rd Metronome 160 30 y » 5 y > 58 + 4.50 13th Light and tone 30 y y 4 y 1 47 + 5.02 44th Metronome 160 30 > y 4 y y 48 + 5.10 1st Light alone 30 * y 3 y y 48 5.13 36th Bell 30 y y 2 y y 87 + 5.17 45th Metronome 160 30 ? ) 5 y y 54 + (Oct. 23,1925) 3.40 46th Metronome 160 30 y y 2 y y 22 + 3.46 14th Light and tone 30 y y 4 y y 48 + 3.56 47th Metronome 160 30 y y 5 y y 58 + 4.04 1st Tone alone 30 13 y y 6 4.07 37th Bell 30 5 > 1 y y 67 + 4.15 20th Metronome 90 30 ? 5 28 y y 1 — 4.19 48th Metronome 160 30 5 > 10 y y 28 + 4.25 49th Metronome 160 30 5 5 7 y y 50 + The strength of the tone was then slightly increased and the new complex stimulus tried fifteen times, and then the tone alone unnacom- panied by feeding. The complex gave a manometer reading of 50, the tone alone one of 8 (16 per cent.). The tone was again increased so that it became clearly audible