Visual object categorisation at distinct levels of abstraction: a new stimulus set

Area of Science:

• Cognitive Psychology
• Visual Perception
• Image Recognition

Background:

• Understanding how humans categorize and name visual stimuli is fundamental to cognitive science.
• Previous research highlights the importance of basic-level categories in object recognition.
• A standardized stimulus set is needed to reliably assess naming behavior and its underlying mechanisms.

Purpose of the Study:

• To introduce a novel stimulus set comprising 269 line drawings of everyday artifacts and animals.
• To investigate the extent to which these stimuli are named at the basic versus subordinate level.
• To validate the stimulus set by correlating typicality ratings with the level of naming.

Main Methods:

• Development of a stimulus set with 269 line drawings representing 25 basic-level categories.
• Experiment 1: Participants named stimuli, and naming levels (basic vs. subordinate) were recorded.
• Experiment 2: Typicality ratings were collected and correlated with naming levels.
• Experiment 3: Stimulus degradation (local fragment shifts) was used to assess the role of global configuration.

Main Results:

• The stimulus set effectively elicited naming at both basic and subordinate levels.
• Higher typicality ratings significantly correlated with basic-level naming, validating the set's calibration.
• Object naming remained robust even with degraded images, indicating reliance on global configuration.

Conclusions:

• The developed stimulus set is a valid tool for studying object recognition and naming.
• Global stimulus configuration plays a crucial role in achieving basic-level object identification.
• This research provides insights into the perceptual basis of categorization and naming in humans.