Attention or instruction: Do sustained attentional abilities really differ between high and low hypnotisable persons?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Hypnosis Research

Background:

• Previous studies suggest highly hypnotisable participants (highs) are more sensitive to bistable figures than low hypnotisables (lows).
• This sensitivity was often linked to superior sustained attention in highs.
• An alternative explanation involves differing expectation-based strategies influenced by hypnotisability levels.

Purpose of the Study:

• To investigate whether hypnotisability influences strategy use when perceiving bistable figures.
• To test if demand characteristics differentially affect highs and lows regarding ambiguous figure perception.
• To determine if reported perspective changes in highs reflect attentional differences or strategic implementation.

Main Methods:

• Utilized a Necker cube as a bistable visual stimulus.
• Manipulated demand characteristics by providing participants with tailored information based on their hypnotisability level.
• Participants were informed about previous findings related to perspective switching or maintenance in individuals with similar hypnotisability levels.

Main Results:

• Highly hypnotisable participants were significantly influenced by the provided information regarding perspective changes.
• Low and medium hypnotisable participants did not show similar susceptibility to the manipulated demand characteristics.
• Highs did not demonstrate superior ability in maintaining a single perspective compared to lower hypnotisability groups.

Conclusions:

• The enhanced sensitivity of highs to bistable figures likely stems from employing different cognitive strategies.
• Demand characteristics, tailored to hypnotisability, significantly impact how highs engage with ambiguous stimuli.
• Findings challenge the notion that higher sensitivity in highs is solely due to more efficient sustained attention, supporting a strategy-based explanation.