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Los autores agradecen a Ofelia Citlalli López por su asistencia en la revisión de los videos y a Rosalío Ávila y Lilia Prado por facilitarnos un antropómetro para el registro de las dimensiones corporales. Partes de este trabajo fueron presentados en el XXII

Four experiments measured pigeons' pecking at a small touch-screen image (the CS) that moved toward or away from a source of food (the US). The image's effectiveness as a CS was dependent on its motion, direction, and distance relative to the US. Pecking to the CS increased with proximity to the US when the CS moved toward the US (Experiment 1). This held true even when a departing CS signalled a US of greater magnitude (Experiment 2). Response rates to stationary stimuli were greater the closer they were to the hopper; but rate was less than when the same spot was part of a motion toward food, and greater than when it was part of a motion away (Experiment 3). The rate of responding in all three cases (motion toward, stationary, motion away) decreased exponentially with distance from the hopper. The distance and motion effects observed under these Pavlovian contingencies were different when pecking to the spot was required for reinforcement (Experiment 4).

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