page_title: Tachistoscope
hierarchical_section_title: Tachistoscope
caption_attribution_description: English: Identifier: manualofmentalph00whip (find matches) Title: Manual of mental and physical tests&#160;: in two parts&#160;: a book of directions compiled with special reference to the experimental study of children in the laboratory or classroom Year: 1921 (1920s) Authors: Whipple, Guy M. (Guy Montrose), 1876-1941 Subjects: Psychophysiology Psychological tests Intelligence Tests Child Psychology Publisher: Baltimore&#160;: Warwick &amp; York Contributing Library: University of Connecticut Libraries Digitizing Sponsor: University of Connecticut Libraries View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: y Binet, Cattell, Dodge, Erdmann and Dodge,Goldscheider and Miiller, Becher, Wundt, Huey and Zeitler. A shortsummary of these issues was published by the author in the first editionof this work. It may be pointed out merely that the black pre- and post-exposure fields of the disc tachistoscope here prescribed afford the mostbrilliant possible exposures, with longest retinal effects, so that an ex-posure of 50 to 75 a will give a well cleared-up image (to employDodges term) and at the same time eliminate eye-movement. ^his instrument, devised by the author and employed by him in study-ing the effect of practise on the range of attention does not fulfill all ofthe requirements of the ideal tachistoscope, but it has the merit of beingrelatively inexpensive, simple in operation and construction, and ofanswering satisfactorily for comparative tests. It has also been designed»with a view for use both for these short and for much longer exposures(Test 25). TEST 24: RANGB OV VISUAL ATTENTION Text Appearing After Image: FIG. 57. DISC TACHISTOSCOPE. and figures, Size 8. Drawing ink and ruling pen. Head^rest,with suitable supports and claraps. (Fifty vibrations dry-con-tact fork (Fig 58.) Dry battery. Connecting wire.) Preliminaries.—Prepare a series of exposure cards by useof the gummed letters and figures. Paste tbe letters smoothlyand evenly, and center the series on each card. The test objects should iudude isolated letters, groups of letters, or lettersmixed with digits in nonsense arrangement, in numbers fromtwo to eight or ten per card. Prepare other cards with shortwords, short sentences, or columns of digits. Prepare stillothers with the aid of drawing ink, so as to present regular orirregular series of spots, lines, geometrical figures, surfaces, Suggestions for the construction of head-rests are given by Judd. 266 ATTENTION AND PERCEPTION etc., in varied fashion/ It is well to confine the objects, in sofar as possible, to an area 50 mm. wide and 35 mm. high. Ex-posure cards can also be for Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
context_page_description: A tachistoscope is a device that displays an image for a specific amount of time. It can be used to increase recognition speed, to show something too fast to be consciously recognized, or to test which elements of an image are memorable. Projection tachistoscopes use a slide or transparency projector equipped with the mechanical shutter system typical of a camera. The slide is loaded, the shutter locked open, and focusing and alignment are adjusted, then the shutter is closed. When ready for the test, a shutter speed is selected, and the shutter is tripped normally.
context_section_description: A tachistoscope is a device that displays an image for a specific amount of time. It can be used to increase recognition speed, to show something too fast to be consciously recognized, or to test which elements of an image are memorable.  Projection tachistoscopes use a slide or transparency projector equipped with the mechanical shutter system typical of a camera.  The slide is loaded, the shutter locked open, and focusing and alignment are adjusted, then the shutter is closed.  When ready for the test, a shutter speed is selected, and the shutter is tripped normally.
caption: 1921 tachistoscope,
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