During auditory bistable perception, a sequence of tones can be heard either as a single stream (integrated percept) or as two parallel streams (differentiated percept). Neural recordings showed that when perceptual alternations arose spontaneously, the integrated percept corresponded to increased neural information integration and decreased neural information differentiation across frontoparietal regions, while the differentiated percept showed the opposite pattern. When perception was driven by an external change in the sound stream, neural oscillatory power distinguished between percepts but information measures did not. The findings demonstrate that integration and differentiation of conscious perception map onto theoretically motivated neural information signatures, suggesting a direct link between phenomenology and neurophysiology.
Neurophenomenology aims to bridge qualitative and quantitative methods in consciousness research through reciprocal constraints between first-person accounts and neurophysiological data, but has faced methodological difficulties in systematically obtaining and analyzing subjective reports. Recently developed second-person methods—interview techniques that elicit verbal and non-verbal information—offer a way to obtain detailed subjective reports. This paper examines the potential of second-person methodologies for neurophenomenology, describes available interview techniques, analyzes two experimental studies that incorporate them, and identifies the validation problem of comparing results across participants and interviewers. The authors argue that second-person methods are a powerful approach for closing the gap between experiential and neurobiological levels of description.