Which intelligence type defines the ability to have an insight into the self, according to Gardner (1999)?

Spatial intelligence involves the ability to visualize and manipulate spatial relationships and is typically associated with fields like architecture and design. This type of intelligence focuses on external environments rather than internal self-awareness, making it irrelevant to the concept of insight into the self.

Interpersonal intelligence refers to the ability to understand and interact effectively with others. While it involves social awareness and the ability to empathize and communicate, it does not pertain to self-insight or self-reflection, which are the hallmarks of intrapersonal intelligence.

Logical-mathematical intelligence is characterized by the capacity to analyze problems logically, perform mathematical operations, and investigate issues scientifically. This intelligence is concerned with logical reasoning and problem-solving rather than self-understanding, thus making it unrelated to the insight into one's own self.