Inversion effects in the expert classification of mammograms and faces

Area of Science:

• Cognitive Psychology
• Radiology
• Medical Imaging Analysis

Background:

• Expert perception relies on rapid stimulus detection and categorization.
• Holistic perception, where stimuli are processed as integrated wholes, is theorized to underlie expert rapid detection.
• Radiological expertise may involve holistic processing, analogous to face perception.

Purpose of the Study:

• To investigate whether radiological perception of mammograms exhibits inversion effects, a hallmark of holistic processing.
• To compare the perception abilities of experienced radiologists and radiology residents.
• To determine if holistic processing in mammogram interpretation is a learned skill.

Main Methods:

• Experienced and resident radiologists judged the normality of upright and inverted mammograms.
• Participants also judged upright and inverted facial expressions (happy/neutral) for comparison.
• Accuracy and response times were measured for both tasks.

Main Results:

• Facial expression discrimination was significantly better for upright faces, confirming the expected inversion effect.
• Experienced radiologists showed a similar inversion effect for mammograms, with higher accuracy for upright images.
• Radiology residents performed worse and did not exhibit an inversion effect for mammograms.

Conclusions:

• Mammogram interpretation by experienced radiologists demonstrates characteristics of holistic processing, including an inversion effect.
• The absence of an inversion effect in less experienced residents suggests this is a learned skill.
• Holistic processing contributes to the expertise in rapid mammogram abnormality detection.