Distance perception in the spiny mouse Acomys cahirinus: vertical jumping

Area of Science:

• Zoology
• Animal Behavior
• Sensory Perception

Background:

• Acomys cahirinus, a precocial muroid, exhibits precise jumping in natural environments.
• Previous observations noted a lack of jumping from a 25 cm height in a laboratory setting, prompting further investigation.

Purpose of the Study:

• To investigate the jumping behavior and depth perception of Acomys cahirinus in controlled laboratory conditions.
• To determine how different environmental stimuli, such as platform height and substrate pattern, influence jumping decisions.

Main Methods:

• Acomys cahirinus were tested on jumping performance from varying platform heights (6.4 cm and 25.4 cm).
• Jumping responses were observed on different sized checkered substrates and from a visual cliff apparatus.
• Trial spacing (simultaneous vs. separate conditions) was manipulated to assess stimulus effectiveness.

Main Results:

• Adult mice discriminated between the two platform heights and between different checkered floor patterns.
• A majority of adult and neonatal mice chose the shallow side of the visual cliff.
• Individual jumping frequency varied, and postural adjustments indicated good distance perception upon landing.
• Height was a more effective stimulus when presented with all conditions simultaneously, while floor pattern was more effective when presented separately.

Conclusions:

• Acomys cahirinus possesses significant depth and pattern perception abilities, crucial for navigating their environment.
• Environmental factors and experimental design (trial spacing) influence the perception and execution of jumping behavior in this species.
• Individual differences in jumping propensity suggest varied risk assessment or behavioral strategies within the population.