Visual Perception and Cognition in Infancy

By Carl Granrud | Go to book overview
Save to active project

3
What Can Rates of Development Tell Us About Underlying Mechanisms?

Richard Held Massachusetts Institute of Technology

Many investigators of visual development have attributed the appearance and/or changes in sensitivity of discrimination performance with age to neuronal developments in higher visual centers, the cortex in particular ( Atkinson, 1984; Bronson, 1974; Held, 1989; Maurer & Lewis, 1979). The attribution of function to cortex is convincing when based on knowledge of the visual nervous system and its development as studied in animal preparations ( Spillmann & Werner, 1990). Such knowledge provides grounds for asserting that many of the processes that account for properties of visual perception must go on in the cortex. For example, the neuronal equipment for analyzing stereoptic stimuli--single cells responsive to binocular disparities--is not found prior to cortex, but arguments of this kind do not necessarily prove that the changes essential for the development of such properties actually occur at the same loci in the cortex or other higher centers. As Banks and Shannon (this volume) and other investigators have argued, some of these developmental changes may be accounted for at least equally well by lower level (retinal or otherwise) increases in the efficiency of signal processing with resulting increases of the information processing capabilities (resolution and discrimination) of higher level systems that may not have changed. Colleagues and I have suggested just such a possibility in an earlier report on the oblique effect, discussed further on ( Gwiazda, Brill, Mohindra, & Held, 1978). How might decisions be made between these alternatives, given the state of current knowledge? I attempt here to answer this question.

Banks and Bennett ( 1988) applied the logic of sequential ideal-observer analysis, which Geisler spelled out in a recent review ( 1989), to the development

-75-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
Loading One moment ...
Project items
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited page

Bookmark this page
Visual Perception and Cognition in Infancy
Settings

Settings

Typeface
Text size Smaller Larger
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

While we understand printed pages are helpful to our users, this limitation is necessary to help protect our publishers' copyrighted material and prevent its unlawful distribution. We are sorry for any inconvenience.
Full screen
/ 362

matching results for page

Cited passage

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited passage

Welcome to the new Questia Reader

The Questia Reader has been updated to provide you with an even better online reading experience.  It is now 100% Responsive, which means you can read our books and articles on any sized device you wish.  All of your favorite tools like notes, highlights, and citations are still here, but the way you select text has been updated to be easier to use, especially on touchscreen devices.  Here's how:

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select.

OK, got it!

Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.

For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

Already a member? Log in now.

Are you sure you want to delete this highlight?