The present study investigates numerical abilities in domestic chicks (Gallus gallus domesticus). The focus is on the representation of zero, understood as an empty set. In this task, chicks aged between 3 and 6 days had to associate a conditional stimulus (a blue or yellow panel) with a relative non-symbolic numerical target (greater or smaller) in order to receive a food reward. After the familiarization and training phases with the 2vs4 comparison, the chicks were subjected to two tests with 3vs6 or 0vs3 comparisons. Most chicks were able to generalize the learned rule to new numerosities and to represent the empty set within the numerical continuum. Naïve subjects, that is, those facing a test for the first time (with the 3vs6 or 0vs3 comparison), achieved an accuracy significantly above chance, suggesting an understanding of numerical relations even in the absence of prior experience. These results support the hypothesis that numerical cognition, including the representation of the empty set, is present at an early age.
Il presente studio indaga le capacità numeriche nei pulcini di Gallus gallus domesticus. Il focus è posto sulla rappresentazione dello zero, inteso come insieme vuoto. In questo compito, pulcini di età compresa tra 3 e 6 giorni di vita, dovevano associare uno stimolo condizionale (un pannello blu o giallo) ad un target numerico non simbolico relativo (maggiore o minore), per ricevere un rinforzo alimentare. Dopo le fasi di familiarizzazione e training con confronto 2vs4, i pulcini venivano sottoposti a due test con confronti 3vs6 o 0vs3. La maggior parte dei pulcini è stata in grado di generalizzare la regola appresa a nuove numerosità e a rappresentare l’insieme vuoto all’interno del continuum numerico. I soggetti naive, ovvero alla prima esposizione ad un test (con il confronto 3vs6 oppure 0vs3), hanno ottenuto un’accuratezza significativamente superiore al caso, suggerendo una comprensione della relazione numerica anche in assenza di esperienza pregressa. Questi risultati supportano l’ipotesi secondo cui la cognizione numerica, inclusa la rappresentazione dell’insieme vuoto, sia presente in età precoce.
Discriminazione Numerica nel pulcino di pollo domestico (Gallus gallus) : Evidenze Preliminari sulla Capacità di Discriminazione tra Insiemi Vuoti e Non Vuoti
PIROLO, SIMONE
2024/2025
Abstract
The present study investigates numerical abilities in domestic chicks (Gallus gallus domesticus). The focus is on the representation of zero, understood as an empty set. In this task, chicks aged between 3 and 6 days had to associate a conditional stimulus (a blue or yellow panel) with a relative non-symbolic numerical target (greater or smaller) in order to receive a food reward. After the familiarization and training phases with the 2vs4 comparison, the chicks were subjected to two tests with 3vs6 or 0vs3 comparisons. Most chicks were able to generalize the learned rule to new numerosities and to represent the empty set within the numerical continuum. Naïve subjects, that is, those facing a test for the first time (with the 3vs6 or 0vs3 comparison), achieved an accuracy significantly above chance, suggesting an understanding of numerical relations even in the absence of prior experience. These results support the hypothesis that numerical cognition, including the representation of the empty set, is present at an early age.| File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/91048