# Visual hardware

All infant testing procedures have some means of attracting the infants' attention, usually via a visual attention getter.

One difference among methods is whether the visual stimuli are (1) flashing lights (as in classic HPP), (2) videos, or (3) static images presented on monitors, as used in PLP or VFP. BITTSy allows the use of either computer monitors or lights to present visual stimuli.

A second difference among methods is whether all the visual stimuli are in front of the infant, common in PLP, or whether there are also stimuli presented on the sides, as in HPP. BITTSy can control the use of 3 different presentation monitors: one in front, and two on the sides of a test room (plus the monitor for the Experimenter). The monitors can be different sizes. For greatest flexibility, we would recommend a large central monitor (which can be used for PLP and VFP, as well as for the central attention getter for HPP with monitors), and two smaller monitors on the left and right sides of the room (for HPP with monitors). You can also have lights in all three locations.

Thus, BITTSy software allows the researcher to select:

* flashing lights or monitors for each stimulus location
* 1 to 3 stimulus presentation locations (for front only, either or both side locations only, or front and side presentation)

See sections below for more information on these two types of visual stimulus presentation in BITTSy.

{% content-ref url="/pages/-LqgJoFqeioeOprGxUe3" %}
[Displays](/bittsy/set-up/visual-hardware/displays.md)
{% endcontent-ref %}

{% content-ref url="/pages/-LphUqFGnkUFDSi1fylM" %}
[Lights](/bittsy/set-up/visual-hardware/lights.md)
{% endcontent-ref %}

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