Archive & Access
The Archive of Perceptual Response Data · Holdings, access, and digitisation
The Archive of Perceptual Response Data
The Archive of Perceptual Response Data (APRD) is the Institute’s central archival holding. It contains 4,712,034 individual response protocols collected during the Institute’s active research programme, spanning the period from the Institute’s founding in 1967 to the formal sealing of the archive in 2012.
Each protocol in the APRD records a single individual’s response to a standardised projective stimulus: the stimulus presented, the conditions of administration, the subject’s verbatim response, the examiner’s classification of that response according to the Croft Classification System (and, from 1976, the FIM-800 framework), and contextual metadata including the subject’s demographic profile, the date and location of administration, and the research programme under which the data were collected.
The APRD was formally sealed in 2012. No new response protocols have been accepted since that date. The Institute does not solicit new protocol submissions, nor does it collect response data from contemporary assessment deployments. The APRD represents the complete, closed record of the Institute’s active research programme.
Access Tiers
Access to the Institute’s archival holdings is governed by a tiered system that reflects the sensitivity of the materials in question and the qualifications of the researcher seeking access.
Materials designated as Open Access are available for viewing by accredited researchers with institutional affiliation and a documented research purpose. This tier includes published Institute monographs, unclassified symposium proceedings, and bibliographic reference materials. The Reading Room bibliography identifies materials in this tier.
Materials designated as Restricted Access require institutional affiliation, a documented research purpose, and evidence of ethics board approval from the researcher’s home institution. This tier includes unpublished Institute research, individual response protocols from the APRD, and certain executive memoranda. Access decisions are made by the Curator of Collections in consultation with the Director of Research Integrity. Not all requests are approved.
Materials designated as Enhanced Restricted Access require institutional affiliation, a documented research purpose, ethics board approval, a signed acknowledgment of material sensitivity, and specific approval from the Committee on Succession. This tier was created in 2024 following the institutional review and currently applies to one item: Specimen IPS-ARC-2024-001. View specimen record →
Notable Restricted Holdings
Voss Field Notebooks (1973–1977)
The field notebooks maintained by Dr. Helena M. Voss during the FIM-800 classification period are held in the Institute’s archive under Restricted Access. These notebooks document the systematic classification of 800 inkblot stimuli across 47 response dimensions, including stimulus selection criteria, classification decisions, examiner notes, and marginalia. They represent the most detailed surviving record of the FIM-800’s development.
The notebooks have been designated as not available for viewing since their deposition in the archive. The reason for this restriction is not documented. The restriction has never been challenged by any researcher. The notebooks have never been requested for release.
Croft, March & Voss-Hartley Working Paper (2016)
A single copy of the unpublished working paper “Perceptual Consistency in Non-Clinical Populations: Observations from Game-Based Inkblot Response Data” (Croft, March & Voss-Hartley, 2016) is held in the Institute’s archive under Restricted Access. The paper draws on response data gathered through gameplay rather than clinical assessment, applying projective classification methodology to non-clinical response patterns. It was never submitted for publication. No peer review was conducted. The paper is referenced in the Reading Room bibliography.
Alpern Temporal Classification Research (c. 1985–1992)
The unpublished portions of Prof. Judith K. Alpern’s research on temporal classification patterns—how individuals categorise events in time, not just visual stimuli—are held in the Institute’s archive under Restricted Access. Alpern’s published work on response latency and semantic categorisation is cited in the assessment methodology literature. Her unpublished work, which extends projective classification beyond visual stimuli into the domain of temporal experience, has not been cited in any published research known to the Institute. Alpern (1992) in the Reading Room →
Digitisation Programme
The Institute has been systematically digitising archival materials since 2019 in partnership with J. B. Fowler (Precision Stimuli). The digitisation programme employs high-resolution spectral scanning, colour calibration against physical reference standards, and rigorous quality assurance against original specimens. Digitised materials undergo validation against the perceptual equivalence standards established by the Perceptual Analytics Group (PAG-PAS-001) to ensure that digital reproductions elicit response patterns statistically indistinguishable from physical originals.
As of the most recent audit, 3,204 of the Institute’s 12,847 holdings have been digitised. The programme prioritises materials at risk of physical degradation and those most frequently requested for remote research access. The digitisation programme is ongoing.
Applying for Access
Researchers seeking access to the Institute’s archival holdings should direct a written request to the Institute’s registered address in Zürich, Switzerland. Requests should specify the materials sought (including accession numbers where known), the research purpose for which access is required, the researcher’s institutional affiliation, and evidence of ethics board approval where the materials requested are classified as restricted or enhanced restricted.
All access requests are reviewed by the Curator of Collections, the Director of Research Integrity, and (for enhanced restricted materials) the Committee on Succession. Review times vary. Researchers should expect a minimum review period of three months and should not assume that access will be granted. Contact information and correspondence procedures →
Classification Applications
The Institute’s classification frameworks, including the Croft Classification System and the Full Inkblot Matrix (FIM-800), were developed for the classification of projective responses to visual stimuli in research settings. The Institute is aware that its classification frameworks have been applied by third parties to domains for which they were not designed and in which they have not been validated, including natural formation taxonomy, temporal memory pattern classification, and commercial pre-hire assessment.
The Institute has not validated its classification frameworks for any of these applications. Researchers and organisations applying Institute-derived classification systems outside their original domain do so without the Institute’s endorsement and without reference to Institute validation data.