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Research on Guidance Devices for the Blind

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Research on Guidance Devices for the Blind P-1IT RESEARCH ON GUIDANCE DEVICES FOR THE BLIND Jk Progress Report *>* trorh done at the HASKINS LABORATORIES New York City Between February 15, 1944 and December I, 1946 under the Auspices oi THE COMMITTEE ON SENSORY DEVICES The National Academy of Sciences NIT Iowa 623.893 .78 .H351 1241 . t r PRINT 600.78 N. The National Academy of Sciences. RESEARCH ON GUIDANCE DEVICES FOR THE BLIND. r. 1 DATP nilF PRINT 600.78 N. The National Academy of Sciences RESEARCH ON GUIDANCE DEVICES FOR THE BLIND. c. 1 y UBRARY 'OVA COMMISSION FOR TIIE BUM) Fwtk tad Kwwauqua W„7 &«• Moiae*, Iowa 50309 RESEARCH 01? GUIDANCE DEVICES FOR THE BLIND A Progress Report of Work done at the IIASKINS LABORATORIES New York City between February 15, 1944 and December 1, 1946 under the Auspices of THE COMMITTEE ON SENSORY DEVICES The National Academy of Sciences i Prepared by the Staff o 3 Haskins Laboratories and approve _ or submission to the Committee on Sensory Devices by: J. JT dU^H, ife ?'^fy~4&_^ Project Direcci. Decembe) 1, 1946 ' TABLE OF CONTENTS I. INTRODUCTION Page No, A. THE CENTRAL LABORATORY 1 B. TBE GUIDANCE DEVICE PROGRAM 2 C. THE PRESENT REPORT U D. FUTURE WORK ... 6 II. PHYSICAL ASPECTS OF GUIDANCE DEVICES A. GENERAL STATEMENT OF THE PROBLEM 7 B. PROPAGATION OF RADIANT ENERGY . 1, General Properties of Wave Propagation 8 2. Propagation Properties of Supersonic Radiation 9 3# Propagation Properties of Electromagnetic Radiation ; Visual Region 20 h» Propagation Properties of Electromagnetic Radiation ; '. Non-visual Region '. I ". I 22 C. ELEMENTS OF SYSTEM ENGINEERING 1. Design Objectives of a Short Range Obstacle Locator 25 2. Supersonic Systems .26 3» Optical Systems 33 D. GUIDANCE DEVICE SYSTEMS 1« Supersonic Guidance Devices kO 2. Audio-Frequency Devices 66 3« Optical Guidance Device Systems 67 U« The Pattern Optical Device (Recognition Device); XA-6HL • 80 £>• Characteristics of Guidance Device Systems thus far Developed • 83 6« Maintenance of Guidance Device Systems 63 Page No« III. EVALUATION TESTS A. ORIENTATION 1, Some sources of difficulty for blind persons 85 2. Summary 87 B. EVALUATION OF A SUPERSONIC GUIDANCE DEVICE WITH REGARD TO ITS USE IN LOCATING DOORWAYS 1. Purpose 88 2. Procedure 88 3» Subjects 9k h» Results and Discussion 9U 5. Summary 97 C. COMPARISON OF SEVERAL GUIDANCE DEVICES AS AIDS TO THE BLIND IN THE AVOIDANCE OF STATIONARY OBSTACLES 1. Introduction 99 2. Purpose 99 3. Description of Obstacle Course A 99 h* Description of Obstacle Course B 101 5» General procedure 101 6. Subj ects 103 7. Results 103 8. Summary 108 D. TRAINING IN THE USE OF PROBE DEVICES 1. Training Procedure 110 2. Improvement in Performance as a Result of Training and Practice 121 3. Summary 128 h» Appendix 131 E. TEST OF OBSTACLE COURSE PERFORMANCE OF FOUR PROBE DEVICES WITH HIGHLY TRAINED SUBJECTS 1. Purpose 13U 2. Procedure 13U Page No. 3. Subj ects • « 13U U« Results 13U 5» Preliminary Evaluation Study of New Devices •••••• 137 6. Time per trial in the obstacle course • 139 7* Summary lUl F. A COMPARISON OF THE EFFECTIVENESS OF TWO PROBE GUIDANCE DEVICES IN THE DETERMINATION OF OBSTACLE SIZE 1. Purpose Ht3 2* Procedure ••• ••••••• Hi3 3* Subj ects ••• 1U5 U. Results • •• II4.5 5. Summary •••••• H4.9 G. A COMPARISON OF THE UTILITY OF THREE PROBE GUIDANCE DEVICES FOR THE DETECTION OF A STEP-DOWN 1. Introduction • • 151 2. Procedure ••••• 151 3» Subjects ••• •••• 151 U. Results 153 5. Summary ••••• 155 H. A COMPARISON OF AUDITORY AND TACTUAL SIGNAL SYSTEMS IN OBSTACLE AVOIDANCE TESTS 1« Purpose 157 2. Subj ects 157 3« Procedure 158 U. Results 158 5. Summary ••••• •• 159 I. A TEST OF THE ADEQUACY OF THE SIGNAL-RANGE RELATION IN TWO GUIDANCE DEVICES 1« Introduction 160 2. Purpose • 161 Page No. 3. Procedure 161 U. Subjects 163 $. Results 163 6. Conclusions 172 7. Summary 173 J. USE OF SUPERSONIC DEVICES AS RANGE INDICATORS 1. Purpose 17U 2. Subj ects 17U 3. Procedure 17h U. Results 175 5. Conclusions 179 6. Summary 179 K. OUTDOOR TESTING PROGRAM 1. Introduction f 180 2. Observations made at Westport, Conn. 180 3. Observations made at the New York Institute for the Blind . I8I4. L. EVALUATION OF THE "OBSTACLE SENSE" OF THE SUBJECTS USED AT HASKINS LABORATORIES 1. Purpose 192 2. Subj ects 192 3. Procedure 192 h. Results 193 E>. Summary 196 M. ELECTRICAL STIMULATION OF THE OPTIC NERVE 197 N. DESCRIPTIONS OF SUBJECTS 202 IV. SUMMARY 20U Table 2.1 Guidance Device Nomenclature 206 Table 2.2 Characteristics of Guidance Devices Developed 208 I. INTRODUCTION A. THE CENTRAL LABORATORY Studies on sensory devices have been in progress at the Haskins Laboratories under contracts 1 administered by the Committee on Sensory Devices since February, 1944. As central laboratory for the Committee, the Haskins group was directed at the beginning of its assignment (1) to act in a general technical advisory capacity to the Committee, (2) to undertake the critical evaluation and study of the usefulness to the blind of devices produced by other contractors sponsored by the Committee, and (3) to carry on collateral •technical and psychological research on guidance devices and reading machines for the blind. The Haskins Laboratories maintain engineering and psychological testing facilities on three floors of the building at 305 East 43rd Street in New York City. The personnel of the Laboratories, most of whom are concerned with work on sensory devices, includes seven engineers and physicists, four psychologists, two physiologists, seven technical and laboratory workers, six shop workers, and four clerical workers. A number of blinded veterans are employed by the Laboratories on a part time basis to act as subjects in the testing program. 1 Work by the Haskins Laboratories for the Committee on Sensory Devices has been supported through the following contracts: Contract No. VAm-21223, administered through the National Academy of Sciences, under sponsorship of the Veterans Administration. July 1, 1946 to June 30, 1947. Contract No. W-49-007-MD-347, administered through the National Academy of Sciences, under sponsorship of the Office of the Surgeon General, U.S. Army. November 1, 1945 to June 30, 1946. Contract No, OEMcmr-522, administered through the National Academy of Sciences, under sponsorship of the OSRD. October 1G, 1945 to October 30, 1945. Contract No. OEMsr-1316, administered through the OSRD. February 15, 1944 to October 15, 1945. - 1 - - 2 - The program of work at the Haskins Laboratories falls broadly into three categories: (1) guidance devices, (2) reading machines, (3) cooperation with the Armed Services and certain other extra-mural agencies. The present report concerns itself with the first category and to some extent with the third. B. THE GUIDANCE DEVICE PROGRAM IRhen the Committee's work on guidance devices was initiated, the objective was set in rather general terms as the development of a portable device which would enable the average blind person to find his way about with more ease and efficiency than with the aid of the traditional cane or the seeing-eye dog. In the initial stages of the program, it was felt that a hand-held "probe" capable of locating objects and giving range information up to distances of perhaps fifty feet would prove useful. The possibilities were considered of using optical, supersonic, radar, or proximity fuse techniques. Supersonic methods appeared to warrant major attention, particularly in view of the rather considerable maximum range thought to be necessary. Since the signals given by such a device would be rather complex, varying rapidly in intensity, frequency, and quality, it was decided to use auditory presentation at the start, partly for convenience, but mostly in the hope that the user could integrate the detailed point-by-point information into a helpful mental construct of his environment. The extent to which point-by-point information can be so integrated remains one of the outstanding fundamental problems. It became apparent during the course of the work that there are tiro specific and quite different requirements for guidance devices. The first is for what might most accurately be called a short-range obstacle locator, i.e., a simple, highly portable unit which could be used to locate objects and - 3 - obstructions and to give tactile indications of range up to about ten feet. It could be used continuously or intermittently in familiar surroundings to check the location of landmarks and to avoid moving obstacles. The second and more difficult requirement is for a recognition device which can provide "patterned" information, i.e., a plan impression good enough to be useful in identifying objects and in forming a mental construct of a new environment. Devices to meet the first requirement have received major emphasis, and most of the tests have been directed to their evaluation in the detection and location of obstacles at short ranges. The devices thus far available for testing have been comparatively crude and, until the recent use of tactile stimulators, have employed the auditory entry portal. However, the results have been definitely encouraging on two counts: (1) the blind subjects can learn to use the devices with considerable success in many types of situations, (2) the power and weight requirements of the devices are small enough that final models can be expected to be quite readily portable. Thus the prospects seem good for the development of a successful general-use short-range obstacle detector. "Whether the final device will utilise light or supersonics is not yet clear; experience thus far, and user reaction to the devices tested, appear somewhat to favor the supersonic method. The prospect for a successful pattern device is more difficult to assess since the determining factor is the perceptive process for auditory or tactual patterns.
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