Visual Discrimination Task in Guppies Using a Simultaneous Matching-to-Sample Procedure.

Area of Science:

• Comparative Cognition
• Animal Behavior
• Neuroscience

Background:

• Fish cognitive abilities are increasingly studied using paradigms common in mammals and birds.
• Evidence for fish performance in the simultaneous match-to-sample task (sMTS) is mixed.
• The capacity of fish to discriminate stimuli based on sameness requires further investigation.

Purpose of the Study:

• To investigate guppies' (Poecilia reticulata) ability to solve the simultaneous match-to-sample task (sMTS).
• To determine if guppies can discriminate stimuli based on sameness.
• To assess the influence of training set size and stimulus type on guppy performance in sMTS.

Main Methods:

• Guppies were trained on the sMTS using various stimuli sets: two colors, two shapes, and multiple shapes.
• Performance was analyzed using binomial tests, t-tests, and generalized linear mixed models.
• The study examined learning speed and accuracy across different experimental conditions.

Main Results:

• Guppies successfully learned to identify the matching stimulus in the sMTS across all experiments.
• No significant effect of training set size on performance was observed.
• Guppy accuracy was higher when multiple training stimuli were utilized.

Conclusions:

• Guppies possess the cognitive capacity to perform the sMTS, discriminating stimuli based on sameness.
• The use of multiple training stimuli may enhance generalization abilities in fish.
• These findings provide a foundation for future research, including delayed versions of the sMTS in fish.