Numerical discrimination of visual stimuli by pigs

[Speaker] Ueno, Ryousei:1
[Co-author] Taniuchi, Tohru:2
1:Ishikawa Prefectural University (Japan), 2:Kanazawa University (Japan)

We had studied numerical discrimination in pigs displaying two dots and three dots widely positioned on screen. Performance was affected by the position of dots. In present study we tried narrowing the positioning area and tested the performance on the discrimination. The patterns of two dots and three dots were 6 and 4, respectively. Forty eight trials in a session were conducted. Average Correct response rates during the 11th - 24th session were 70.1% in pig A, 72.5% in B. It was suggested dot positions were used as a cue because of bias in correct response rates according to the combination of positive and negative stimuli. Next, we trained Pig B using the rotating stimuli those have the same configuration as the earlier training. The subject attained above 80% correct rates in consecutive three sessions from the 23th. The subject learned the task without positional cues.
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